SIGNI S/C Plastic Back Grinding Disc for Granite/Marble/Concrete and Glasses (36 Grit, 4.5 inch)

We use this discs when filling control joints in warehouses with polyurea joint filler compounds. This disc is aggressive enough to remove the overfilled material, but does not leave significant scratching on the concrete. This is great to use when we are only filling joints and not grinding the entire concrete slab. It is a great option for polished concrete and coating professionals/DIY'ers.

These are awesome for fiberglass, fixing an old boat, it just literally chunks it out, even use it too cut too. They last a long time

they worked as expected.

These grinding discs do a great job at smoothing uneven concrete surfaces. I would buy them again

Powerful, need good experience if you using grinder to operated it with very steady hand to control this abrasive wheel

Works very well and will last long as well!

Very poor quality, barely used them and they were worn out

They grind very fast