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, 60 Grit | Jumbo High Density Sanding and Finishing Wheels for Angle Grinder, 10-Count

Benchmark Abrasives 4.5" x 7/8" Zirconia Type 29 Flap Discs, 60 Grit | Jumbo High Density Sanding and Finishing Wheels for Angle Grinder, 10-Count

Product ID: 27051537

Details

Brand
Benchmark
Compatible Devices
Angle Grinder
Grit Material
Zirconia
Grit Type
60
Product Dimensions
4.5"L x 4.5"W

🔥60 grit zirconia for aggressive stock removal

🔩Fits 7/8" arbor angle grinders

⚙️4.5" diameter for precision

274.94 DT

Duties & taxes included

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Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡️ Elevate your grind game with pro-grade zirconia power!

MULTI MATERIAL MASTERY - Seamlessly grind cast iron, steel, titanium, fiberglass, wood, and more—perfect for diverse industrial and DIY projects.
JUMBO HIGH DENSITY DESIGN - Maximize surface blending, beveling, and rust cleanup with a curved profile engineered for pro-level finishing.
INDUSTRIAL GRADE RELIABILITY - Exceeds ANSI and EU standards for abrasive products, built to handle everything from aggressive stock removal to delicate finishing.
PREMIUM EUROPEAN ZIRCONIA CLOTH - Experience consistent abrasion and long-lasting durability with uniform particle size and superior ingredient blend.
UNIVERSAL GRINDER COMPATIBILITY - Fits top brands like Dewalt, Milwaukee, Makita, Bosch, and more, ensuring a secure fit on 4.5" and 5" grinders.

Benchmark Abrasives 4.5" x 7/8" Type 29 flap discs deliver high-density, jumbo sanding and finishing performance with premium European zirconia cloth. Compatible with major angle grinder brands, these 60 grit discs excel in multi-material applications from metal to wood, meeting rigorous ANSI and EU standards for industrial durability and precision.

Specifications

ASIN	B01D0HIIJE
Best Sellers Rank	#1,708 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #2 in Flap Discs
Brand Name	Benchmark Abrasives
Compatible Devices	Angle Grinder
Compatible Disc Grinder Tool Models	DEWALT DWE4559CN
Compatible Material	Metal
Construction Type	Bonded
Customer Reviews	4.6 4.6 out of 5 stars (672)
Grit Material Type	Zirconia
Grit Number	60
Grit Type	60
Industry Standard Identifier	Type 29
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	0.88 inches
Manufacturer	Benchmark Abrasives
Material Type	Aluminum Oxide, Ceramic
Maximum Rotational Speed	13300 rpm
Model	BM-F4.5SZ60T29HD
Number of Items	10
Part Number	BM-F4.5SZ60T29HD
Recommended Uses For Product	Rust Removal
Set Name	Grit Size Set
UPC	728028210705 072802810705
Unit Count	10 Piece

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