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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⚡ Grind smarter, not harder — the pro’s choice for flawless finishes!

BULK PACK ADVANTAGE - 10-pack bundle keeps your workflow uninterrupted and your toolbox ready.
UNMATCHED DURABILITY - High-density zirconia grains deliver longer life and faster material removal.
PRECISION GRINDING POWER - 4.5" diameter fits most angle grinders for versatile, professional use.
AGGRESSIVE TYPE 29 DESIGN - Angled flap disc face ensures efficient grinding and smooth blending on metal.
CERTIFIED SAFETY STANDARD - Meets ANSI requirements so you can work confidently and safely every time.

Benchmark Abrasives 4.5" x 7/8" Type 29 flap discs feature premium high-density zirconia grains designed for aggressive grinding and finishing on metal. Engineered for angle grinders, these 40 grit discs meet ANSI safety standards and come in a convenient 10-pack, making them the top pick for welders and metal fabricators seeking durability and precision.

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Manufacturer	Benchmark Abrasives
Part number	BM-F4.5SZ40T29HD
Item Weight	113 g
Product Dimensions	11.43 x 11.43 x 1.27 cm; 113.4 g
Manufacturer reference	BM-F4.5SZ40T29HD
Style	Type 29 - Angled Face
Material	Premium Zirconia Grains
Pattern	40 Grit
Item thickness	0.88 Inches
Power source type	Angle Grinder
Item Package Quantity	10
Grit Rating	40
Grit Description	Coarse
Batteries Included?	No
Batteries Required?	No

Benchmark Abrasives 4.5" x 7/8" Premium High Density Jumbo Zirconia Type 29 Flap Disc 40 Grit - 10 Pack

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