--- product_id: 5146435 title: "Steel Combination Square with Square Head - 12\" Blade Length, Cast Iron Heads, Reversible Lock Bolt, Scriber, Spirit Level, 4R Graduation Type - 11H-12-4R" brand: "starrett" price: "Β£124.41" currency: GBP in_stock: true reviews_count: 13 category: "Starrett" url: https://www.desertcart.co.uk/products/5146435-steel-combination-square-with-square-head-12-blade-length-cast store_origin: GB region: United Kingdom --- # 12" hardened steel blade 4R graduation (1/8, 1/16, 1/32, 1/64) cast iron square head Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Heads, Reversible Lock Bolt, Scriber, Spirit Level, 4R Graduation Type - 11H-12-4R **Brand:** starrett **Price:** Β£124.41 **Availability:** βœ… In Stock ## Summary > πŸ“ Master precision, own the craft β€” the Starrett standard for pros. ## Quick Answers - **What is this?** Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Heads, Reversible Lock Bolt, Scriber, Spirit Level, 4R Graduation Type - 11H-12-4R by starrett - **How much does it cost?** Β£124.41 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/5146435-steel-combination-square-with-square-head-12-blade-length-cast) ## Best For - starrett enthusiasts ## Why This Product - Trusted starrett brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Versatility for Every Task:** From squaring and mitering to depth and height gauging, this tool adapts seamlessly to all your layout needs. - β€’ **Built to Outlast Your Projects:** Rugged cast iron heads and hardened steel blade deliver lifetime durability, resisting wear, impact, and daily shop abuse. - β€’ **Effortless One-Handed Adjustments:** Reversible lock bolt and smooth thumbwheel let you secure and reposition the blade quickly without interrupting your workflow. - β€’ **Precision that Defines Your Craft:** Engraved 4R graduations ensure ultra-accurate measurements down to 1/64 inch for flawless results every time. - β€’ **Trusted by Professionals, Loved by Makers:** Join thousands of craftsmen who rely on Starrett’s precision and reliability to elevate their work to the next level. ## Overview The Starrett Steel Combination Square features a 12-inch hardened steel blade with a durable cast iron head, equipped with a reversible lock bolt, scriber, and spirit level. Its 4R graduation system offers precise measurements down to 1/64 inch, making it an essential, versatile tool for carpenters, mechanics, and DIY professionals seeking lifetime accuracy and reliability. ## Description Product description Precision Layout and Measuring Tool Designed with a reversible lock bolt, built-in scriber, and integrated spirit level for versatile, accurate measuring and marking in machining, metalworking, and carpentry applications. Durable, High-Quality Construction Features a hardened, machine-divided steel blade with a satin chrome finish for easy readability, paired with cast iron heads coated in a black finish for long-lasting strength and professional performance. Technical Specifications The Starrett 12" Combination Square is a precision-engineered tool built for accuracy, durability, and versatility in layout and measurement tasks. It features a reversible lock bolt, a hardened steel with a machine divided blade, and an integrated spirit level for dependable readings. The cast iron head, finished in black wrinkle, provides strength and stability. Designed with 4R graduations, the blade offers clear divisions in 8ths, 16ths, Quick Reading 32nds, 64ths, making it suitable for fine measurements. With square head included, this combination square delivers reliable performance across a wide range of applications, making it a trusted choice for professionals and craftsmen who demand precision and quality. Find Your Perfect Tool 11H-12-4R C11HC-4-4R C33H-24-4R 11HC-6-4R Review: An amazingly useful tool of heirloom quality - Starrett's 6" inch combination square is regarded by many as a the best on the market. I haven't evaluated any of the other high end squares, but to my mind it is nearly flawless. Why do I think this? It is square, not kinda' sorta' square if you hold it right. I mean square to the point where you can't detect any light between a machinist's reference block and the body or blade even with strong backlighting. Your eye can see light from a 0.001" opening so you know the square is at least this square. You can tighten the thumbwheel using only one hand to achieve the squareness described above. The numbers and lines are engraved so they don't wear off. The engravings are deep enough so that you can put the points of your dividers in them to accurately set the distance between the points. The satin finish on the blade makes it easy to read. The "4R" marking system (1/8, 1/16, 1/32 and 1/64) is more useful than you might realize. It cuts down errors due to misreading the scale and is faster. Reinserting the blade after removing it from the body is easy. On some squares, this is a major hassle. On the Starrett, the protrusion in the body which holds the blade generally stays in place when you remove the blade. If it gets misaligned with the slot, it is easy to rotate it back to parallel with the body so you can reinsert the blade. The spring holding the protrusion has the proper amount of stiffness. Another good thing is that it is rugged. I haven't hit it with a hammer or put a torch to it, but it has suffered a lot of drops onto a wooden floor without damage. Why don't I think it is perfect? It will rust (like almost all steel) if you don't take care of it. By taking care of it I mean storing it dry, free of salt from sweat, and dust. Not a big deal, but this is a precision square so treat it with the care it deserves. A wise man once said, "When you buy quality, you only cry once." Do yourself a favor and buy this square. Review: Perfection! - Perfection. Expensive, but so worth it! ## Features - Designed for Precision - The ruler has a 4R graduation type with 8ths, 16ths, quick reading 32nds, and 64ths that greatly increase the accuracy of your measurements. - Built to Last - Able to withstand even the harshest environments as our combination squares are designed to last a lifetime. They are very reliable and perfect for any project you take on. - Variety of Uses - The square head can be used for a variety of purposes such as scribing right angles and parallel lines, measuring, tri-squaring, mitering, depth gauging, height gauging, and levelling. - Quality Made - The blade is made of hardened steel, offering exceptional durability and resistance to wear, rough usage, high-impact pressure, and shock. - Versatile Layout Tool - Starrett squares are offered in a practical variety of styles to suit the needs of the individual, whether it be a toolmaker, mechanic, carpenter, or a "do-it-yourself" homeowner. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B0002CSBNO | | Best Sellers Rank | #42,455 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #41 in Carpentry Squares | | Brand | Starrett | | Brand Name | Starrett | | Color | Multicolor | | Customer Reviews | 4.7 out of 5 stars 2,486 Reviews | | Global Trade Identification Number | 00049659500554, 00094705119709 | | Graduation Range | 1/64 Inches | | Item Dimensions L x W | 12"L x 1"W | | Item Weight | 1.2 Pounds | | Manufacturer | Starrett | | Material | Alloy Steel | | Material Type | Alloy Steel | | Model | 11H-12-4R | | Part Number | 11H-12-4R | | Product Dimensions | 12"L x 1"W | | Style | 4R Graduation Type | | Style Name | 4R Graduation Type | | UPC | 094705119709 049659500554 | | Unit Count | 1.0 Count | | Warranty Description | One Year on defects in material and workmanship | ## Product Details - **Brand:** Starrett - **Color:** Multicolor - **Graduation Range:** 1/64 Inches - **Material:** Alloy Steel - **Style:** 4R Graduation Type ## Images ![Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Heads, Reversible Lock Bolt, Scriber, Spirit Level, 4R Graduation Type - 11H-12-4R - Image 1](https://m.media-amazon.com/images/I/61tHgdkq+PL.jpg) ![Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Heads, Reversible Lock Bolt, Scriber, Spirit Level, 4R Graduation Type - 11H-12-4R - Image 2](https://m.media-amazon.com/images/I/71bC5QMncVL.jpg) ![Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Heads, Reversible Lock Bolt, Scriber, Spirit Level, 4R Graduation Type - 11H-12-4R - Image 3](https://m.media-amazon.com/images/I/71THcDgPRAL.jpg) ![Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Heads, Reversible Lock Bolt, Scriber, Spirit Level, 4R Graduation Type - 11H-12-4R - Image 4](https://m.media-amazon.com/images/I/71Rqd3tCcBL.jpg) ![Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Heads, Reversible Lock Bolt, Scriber, Spirit Level, 4R Graduation Type - 11H-12-4R - Image 5](https://m.media-amazon.com/images/I/61OIw5MRKXL.jpg) ## Available Options This product comes in different **Model** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ An amazingly useful tool of heirloom quality *by C***S on March 12, 2012* Starrett's 6" inch combination square is regarded by many as a the best on the market. I haven't evaluated any of the other high end squares, but to my mind it is nearly flawless. Why do I think this? It is square, not kinda' sorta' square if you hold it right. I mean square to the point where you can't detect any light between a machinist's reference block and the body or blade even with strong backlighting. Your eye can see light from a 0.001" opening so you know the square is at least this square. You can tighten the thumbwheel using only one hand to achieve the squareness described above. The numbers and lines are engraved so they don't wear off. The engravings are deep enough so that you can put the points of your dividers in them to accurately set the distance between the points. The satin finish on the blade makes it easy to read. The "4R" marking system (1/8, 1/16, 1/32 and 1/64) is more useful than you might realize. It cuts down errors due to misreading the scale and is faster. Reinserting the blade after removing it from the body is easy. On some squares, this is a major hassle. On the Starrett, the protrusion in the body which holds the blade generally stays in place when you remove the blade. If it gets misaligned with the slot, it is easy to rotate it back to parallel with the body so you can reinsert the blade. The spring holding the protrusion has the proper amount of stiffness. Another good thing is that it is rugged. I haven't hit it with a hammer or put a torch to it, but it has suffered a lot of drops onto a wooden floor without damage. Why don't I think it is perfect? It will rust (like almost all steel) if you don't take care of it. By taking care of it I mean storing it dry, free of salt from sweat, and dust. Not a big deal, but this is a precision square so treat it with the care it deserves. A wise man once said, "When you buy quality, you only cry once." Do yourself a favor and buy this square. ### ⭐⭐⭐⭐⭐ Perfection! *by O***S on May 13, 2026* Perfection. Expensive, but so worth it! ### ⭐⭐⭐⭐⭐ The foundation for all clean, accurate work *by 3***H on January 15, 2017* In science, one is quickly taught that errors accumulate geometrically, not linearly. So perhaps that is why I felt no buyers remorse in paying the price for a proper Starret square. I now have the confidence that when I strike a line or square an edge, it is true every time. I dumped all my crummy Stanley squares (not before measuring them against the Starret and finding all of them out of square by some degree and with imprecise straight edges) and now, all of a sudden, my marks all line up when I strike lines for through-mortises. Starret IS precision. Everything about it is finely finished, perfectly engineered, and beautiful. It feels heavy and as solid as a block of granite in the hands. There is no slip, no jiggle. The grade marks are impressed and deeply embossed, easy to read, fine and accurate. The forged body and rule came polished and satin, respectively, and no touch of rust, pitting, or scratching has showed up after weeks of daily use, and a few hard falls onto an oak deck that had my heart pounding- until I realized just how bullet-proof an all-forged Starret really is. For the beginner woodworker, spending 100+ on a ruler seems.. prohibitive. Foolish. Surely a 25 dollar Stanley can do the job? Well, I don't think it can. You can make a straight cut with a 20 dollar saw, and plane smooth with a 15 dollar yard-sale Stanley 4- but not if your measures are off. A good Starret is the foundation for all clean, accurate work, the only way to confirm your planes are flat, your chisels are square, and your stock is jointed proper. Save money any way you can- but not on the one tool that everything else in your shop is measured against. ## Frequently Bought Together - Starrett Steel Combination Square with Square Head - 12" Blade Length, Cast Iron Heads, Reversible Lock Bolt, Scriber, Spirit Level, 4R Graduation Type - 11H-12-4R - Starrett 6-Inch Spring-Tempered Steel Rule with Inch Graduations - Ideal for Metalworking and Engineering - Satin Chrome Finish, 4R Graduations, 3/64-Inch Thickness - C604RE-6 --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/5146435-steel-combination-square-with-square-head-12-blade-length-cast](https://www.desertcart.co.uk/products/5146435-steel-combination-square-with-square-head-12-blade-length-cast) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-04*