would these work to remove paint off a concrete floor?

Yes, but if you have a large area to do the discs will get gunked up with paint. Might want to use paint remover and a metal scraper.

Are these good for wood?

They are actually VERY good on wood. Much faster than most sanders. You have to have a steady hand though.

can this be used for sanding a jon boat?

I wouldn't recommend this for sanding a Jon boat as too much pressure with a grinder could penetrate the skin of the boat.

what grit on these discs would be best to remove light rust and smooth paint on body of a 10 wheel dump truck

I would think 80 grit would do best for the light work you’re describing.

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Benchmark Abrasives 4.5" x 7/8" Zirconia Type 29 Flap Discs, 40 Grit | Jumbo High Density Sanding and Finishing Wheels for Angle Grinder, 10-Count

Product ID: 27934260

Details

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

🔥40 grit coarse zirconia for aggressive stock removal

🔩Fits 7/8-inch arbor angle grinders universally

⚙️4.5-inch diameter for precision

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Description

⚡ Elevate your grind game with the ultimate zirconia flap discs!

INDUSTRIAL GRADE BUILD - Exceeds ANSI and EU standards to handle everything from aggressive grinding to delicate finishing in demanding environments.
MULTI MATERIAL MASTERY - Seamlessly work on steel, stainless, titanium, fiberglass, wood, and more—perfect for automotive, construction, and fabrication.
JUMBO HIGH DENSITY DESIGN - Maximize surface blending, beveling, and rust cleanup with a curved profile engineered for pros and DIYers alike.
PREMIUM EUROPEAN ZIRCONIA CLOTH - Experience consistent abrasion and long-lasting durability with uniform particle size and superior ingredient blend.
UNIVERSAL GRINDER COMPATIBILITY - Fits all major brands like Dewalt, Milwaukee, Makita, Bosch, and more for a secure, precise fit every time.

Benchmark Abrasives 4.5" x 7/8" Type 29 flap discs deliver professional-grade performance with jumbo high-density zirconia cloth for aggressive 40 grit stock removal. Compatible with all major angle grinders, these discs exceed ANSI and EU standards, making them the go-to choice for industrial and DIY projects requiring precision, durability, and versatility.

Specifications

ASIN	B01D0HA3LK
Best Sellers Rank	#1,298 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #1 in Flap Discs
Brand Name	Benchmark Abrasives
Compatible Devices	Angle Grinder
Compatible Disc Grinder Tool Models	DEWALT DWE4559CN
Compatible Material	Stainless Steel
Construction Type	Grinding
Customer Reviews	4.7 4.7 out of 5 stars (2,190)
Grit Material Type	Zirconia
Grit Number	40
Grit Type	Coarse
Included Components	Flap Discs
Industry Standard Identifier	Type 29
Item Diameter	4.5 inches
Item Dimensions	4.5 x 4.5 x 0.5 inches
Item Dimensions L x W	4.5"L x 4.5"W
Item Thickness	0.88 inches
Item Weight	4 ounces
Manufacturer	Benchmark Abrasives
Material Type	Premium Zirconia Grains
Maximum Rotational Speed	13300 rpm
Number of Items	10
Part Number	BM-F4.5SZ40T29HD
Recommended Uses For Product	Rust Removal
Set Name	Grit Size
UPC	072802810699 728028210699
Unit Count	1 Count

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€ 85.70

Duties & taxes included

In stock

Sold byAmazon SlovakiaDelivered 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 Slovakia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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