Professional tool for commercial or occasional use 3" / 75mm diameter wire cup brushes / wheels Fits any grinder with an M14 thread (standard 4-1/2" and 9" Grinders) Perfect for removing paint, deburring and edge blending Twisted bristles make the brushes strong and tough It will rapidly clean and wipe out rust to leave a purer metal finish on most surfaces for a natural look or for use before painting The knotted brush will remove paint and heavily corroded surfaces This listing is for 1 steel wire knot brush