This Dremel grout removal bit (570) is designed for cleaning wall and floor grout or removing grout to replace broken tiles. It is compatible with rotary tools and the 568 grout removal attachment. The bit has a shank diameter of 3.2mm, a bit length of 58mm, and a working diameter of 3.2mm. It has a maximum RPM of 20000 and comes in a pack quantity of 1. This is a genuine Dremel accessory.