These work pretty well as a general bit set for drilling most metals? Is applying oil generally needed on a surface when drilling?

While in trade school many decades ago, they taught us to use cooling for chisels and drill bits, I did dry drilling many times throughout the years, it works; however, cooling will extend the life of the drill bit for sure. One online resource said the following: If you don't cool, the material will harden and the drilling will get tougher. With special cutting oil, you cool both the material and the drill. This makes the drilling faster and more effective. The drill bits also last longer, because they stay sharp. Hope that this answers your question.

Are cobalt bits better than titanium bits?

Yes. Cobalt is harder and can drill through harder materials such as stainless steel.

Is the entire bit comprised of the M35 5% cobalt alloy or is the high cobalt steel just on the surfaces?

The entire bit is comprised of the M35 5% cobalt alloy. That is why they should last longer.

Will this fit in a standard household drill?

Our goal is to provide our customers with the highest quality and service. Yes this M35 HSS Drill Bit will fit just be mindful that this is a straight shank bit.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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GMTOOLS 13Pcs Cobalt Drill Bits Set, M35 HSS 135 Degree Tip, Twist Jobber Length Drill Bit Kit for Hardened Metal, Cast Iron, Stainless Steel, Plastic and Wood with Storage Case 1/16"-1/4"

Product ID: 469337353

Details

Cutting angle string
135 Degrees
Cutting diameter
6.35
Finish type
Titanium
Material
High Carbon
Shank type
Straight

🔩135° Split Point - fast, precise penetration

🧰13-Piece Set - versatile sizes 1/16" to 1/4"

⚙️M35 Cobalt Alloy - 5% Cobalt for max durability

Description

🔧 Drill Like a Pro, Finish Like a Boss!

ORGANIZED READY - Compact, durable storage case keeps your bits secure and accessible—because every pro deserves a tidy toolkit.
UNMATCHED DURABILITY - Crafted with premium M35 high-speed steel infused with 5% cobalt for superior wear resistance and longevity.
VERSATILE SIZE RANGE - Complete 13-piece set covers all your drilling needs from 1/16" to 1/4", ideal for metal, wood, plastic, and more.
PRECISION CUTTING EDGE - 135° split point design ensures quick, centered drilling with minimal walking—perfect for hardened metals and delicate materials alike.
EFFORTLESS CHIP REMOVAL - Twist jobber length design accelerates chip clearance, keeping your work smooth and efficient every time.

The GMTOOLS 13Pcs Cobalt Drill Bits Set features industrial-grade M35 high-speed steel with 5% cobalt, delivering exceptional hardness and wear resistance. Its 135° split point tip ensures fast, precise drilling with reduced walking, while the twist design promotes efficient chip removal. This versatile set includes 13 sizes from 1/16" to 1/4", suitable for drilling through hardened metals, stainless steel, cast iron, plastic, and wood. Packaged in a sturdy storage case, it’s engineered for professionals and DIY enthusiasts seeking reliable, long-lasting performance.

Specifications

ASIN	B0B5R8P9ST
ASIN	B0B5R8P9ST
Best Sellers Rank	#227,553 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #945 in Power Drill Bit Sets
Brand Name	GMTOOLS
Customer Reviews	4.4 4.4 out of 5 stars (727)
Customer reviews	4.4 4.4 out of 5 stars (727)
Cutting Angle String	135 Degrees
Cutting Diameter	6.35 Millimeters
Date First Available	17 July 2022
Finish Types	Titanium
Included Components	1
Manufacturer	GMTOOLS
Manufacturer	GMTOOLS
Manufacturer reference	Cobalt Twist Drill Bit
Material Type	High Carbon Steel
Number of Flutes	2
Number of Pieces	13
Package Dimensions	11.81 x 8.99 x 2.59 cm; 141 g
Part Number	Cobalt Twist Drill Bit
Point Style	Split Point
Set Name	13Pcs Cobalt Drill Bits Set
Shank Type	Straight
Surface Recommendation	Metal
Tool Flute Type	Spiral
Unit Count	1.0 Count

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