What is the thickness of these discs?

The thickness of the abrasive area depends on the grit: - The 80 grit is .497" (12.6mm) thick in the area where the abrasive flaps are and that includes the black mounting wheel/disc - The 120 grit is .315" (8.1mm) thick in the area where the abrasive flaps are and that includes the black mounting wheel/disc The thickness of the black mounting wheel/disc is standard at a little less than 1/8"

which ones do you use for sharpening lawn mower blades?

Type 27 is flat. Type 29 is bevelled. Either could be used to sharpen blades, depending on personal preference.36 or 40 grit is very aggressive for fast stock removal. No need to go any finer than that for mower blades.

Does this have the quick change nut on it?

These fit any 4.5" angle grinders with the standard lock nut, but they DON NOT have the X-Lock type "teeth" to interface with an X-Lock/Quick Change type angle grinder

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Benchmark Abrasives 4.5" x 7/8" Premium High Density Jumbo Zirconia Type 27 Flap Discs 4 1/2 for Angle Grinder, Sanding Discs, Finishing - Grinding Wheels 4 1/2 inch - (10 Pack) - 40 Grit

Benchmark Abrasives 4.5" x 7/8" Premium High Density Jumbo Zirconia Type 27 Flap Discs 4 1/2 for Angle Grinder, Sanding Discs, Finishing - Grinding Wheels 4 1/2 inch - (10 Pack) - 40 Grit

Product ID: 96731870

Details

Brand
Benchmark
Compatible Devices
Angle Grinder
Grit Material
Aluminum Oxide
Grit Type
Zirconia
Product Dimensions
4.5"L x 4.5"W

🔥Premium high-density zirconia for max durability

🔧Type 27 flap disc for versatile grinding & finishing

⚙️4.5" diameter fits most angle grinders

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€ 224.64

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Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Elevate your grind game with Benchmark’s zirconia power!

BULK PACK VALUE - 10-pack bundle designed for pros and DIYers who demand quality and savings.
UNMATCHED DURABILITY - European zirconia cloth ensures longer life and consistent abrasion—outlasts typical discs.
UNIVERSAL COMPATIBILITY - Seamlessly fits Dewalt, Milwaukee, Makita, Bosch & virtually all 4.5" angle grinders.
PRO GRADE PRECISION GRINDING - Engineered for flawless surface blending, beveling, and rust removal with every spin.
INDUSTRIAL STRENGTH PERFORMANCE - Meets ANSI & EU standards for professional-grade stock removal and finishing.

Benchmark Abrasives 4.5" x 7/8" Type 27 flap discs deliver industrial-grade grinding and finishing with premium European zirconia alumina. Compatible with all major 4.5" angle grinders, these 40 grit discs excel in stock removal, surface blending, and rust removal, offering superior durability and consistent performance in a convenient 10-pack.

Specifications

ASIN	B01MU0BBPF
Best Sellers Rank	#6,952 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #7 in Flap Discs
Brand	Benchmark Abrasives
Brand Name	Benchmark Abrasives
Compatible Devices	Angle Grinder
Compatible Disc Grinder Tool Models	DEWALT DWE4559CN
Compatible Material	Stainless Steel
Construction Type	Grinding
Customer Reviews	4.6 out of 5 stars 243 Reviews
Grit Material	Aluminum Oxide, Zirconia, Zirconia Alumina
Grit Material Type	Aluminum Oxide, Zirconia, Zirconia Alumina
Grit Number	40
Grit Type	Zirconia
Industry Standard Identifier	Type 27
Item Diameter	4.5 Inches
Item Dimensions	4.5 x 4.5 x 0.04 inches
Item Dimensions L x W	4.5"L x 4.5"W
Item Thickness	0.5 Inches
Manufacturer	Benchmark Abrasives
Material Type	Zirconia Alumina
Model	BM-F4.5SZ40T27HD
Number of Items	10
Part Number	BM-F4.5SZ40T27HD
Product Dimensions	4.5"L x 4.5"W
Recommended Uses For Product	Rust Removal
Set Name	40 Grit \| 10 Count
UPC	653341412928
Unit Count	10.0 Count

Reviews

R**.

23.12.2025

B**D

16.02.2025

B**R

16.08.2025

S**R

10.03.2024

J**N

16.12.2020

D**S

11.03.2024

J**D

1.05.2025

S**R

10.06.2025

I**Z

20.02.2023

F**E

7.07.2021

D**R

30.07.2021

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Buy anything from 5,000+ international stores. One checkout price. No surprise fees. Join 2M+ shoppers on Desertcart.

€ 224.64

Duties & taxes included

In stock

Sold byAmazon ItalyDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Italy.

Secure transaction

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