What size basin waste backnut does this fit please? will this fit a standard bsp "one and a quarter inch" waste hex backnut (brass or plastic)?

This wrench fits one end 45mm the other end 50mm waste a wonderful tool only let down by not supplying a bar to turn it but this be easily done with a piece of rod or screwdriver

The image is a hexagonal box spanner. Real basin waste nuts are octagonal. Is the image simply generic or is this the wrong product for octogon nuts?

I can confirm that it is a hexagonal box spanner. I think some plastic backnuts are octagonal - although not all - and also some are 47mm and are too big for this spanner. If you buy a brass backnut it should fit and they are stronger than the plastic versions.

The brass backnut on my basin waste is 45mm acroos the flats and I want to know if this basin wrench/box spanner is the correct size. Please advise

I have used this product a lot and it has fitted all the wastes I have tried it on. Great buy 😊

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Monument 46mm x 50mm Waste nut Box Spanner

Product ID: 53632910

Details

Brand
Monument
Colour
Multi
Item length
50 Millimetres
Item weight
0.68 Kilograms
Material
Alloy Steel

📏46mm x 50mm dual-size precision

🔧Slim, long design for tight spaces

⚙️Alloy steel durability

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£17.10

Duties & taxes included

In stock

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Description

🔧 Tighten your grip on every job with Monument’s precision powerhouse!

TRUSTED BY EXPERTS - Endorsed by seasoned engineers and DIY pros alike—your go-to for reliable, professional-grade performance.
TOMMY BAR COMPATIBLE - Holes designed to accept a tommy bar for enhanced torque and effortless tightening or loosening.
DUAL SIZE PRECISION FIT - Two essential nut sizes (46mm & 50mm) in one sleek tool for ultimate versatility.
PREMIUM ALLOY STEEL BUILD - Crafted from bright plated alloy steel for lasting strength and corrosion resistance.
ENGINEERED FOR TIGHT SPACES - Extra-long, slim profile lets you conquer hard-to-reach plumbing and automotive nuts with ease.

The Monument 46mm x 50mm Waste Nut Box Spanner is a polished, alloy steel, double-ended tool designed for plumbing, maintenance, and automotive repairs. Its slim, elongated design fits tight spaces, while compatibility with a tommy bar boosts torque. Highly rated by professionals, it offers durable, precise performance for loosening or tightening waste nuts with ease.

Specifications

ASIN	B01FG9UAFE
Best Sellers Rank	29,803 in DIY & Tools ( See Top 100 in DIY & Tools ) 14 in Box Spanners
Brand	Monument
Colour	Multi
Customer Reviews	4.5 4.5 out of 5 stars (389)
EU Spare Part Availability Duration	1 Years
Finish	Polished
Global Trade Identification Number	05015375003087
Head Style	Box End
Included Components	308L Waste Nut Box Spanner 46 x 50mm
Item Length	50 Millimetres
Item Package Quantity	1
Item Type Name	308L Waste Nut Box Spanner 46 x 50mm
Item Weight	0.68 Kilograms
Jaw Capacity	50 Millimetres
Manufacturer	Monument
Manufacturer Warranty Description	None.
Material	Alloy Steel
Measurement Standard	Metric
Model Number	MON308
Operation Mode	Mechanical
Part Number	MON308
Set Name	No Set

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