Dremel 570 Carbide Grout Removal Bit Ideal for replacing wall and floor grout or removing grout to replace broken tiles.   Easily remove both wall and floor grout. Use with Advantage Grout Removal Attachment #568.   User Tips For best results, insert the accessory bit all the way into the tool and then back it out slightly before tightening down. This provides plenty of shank for the collet or chuck to hold onto the bit. Specifications for 570: Bit Diameter: 3.2 mm Color Code: Red Description: Carbide Grout Removal Bit Shank Diameter: 3.2 mm Max. Speed: 18000 rpm Quanitity: 1 Model Number: 570 Order Number: 2615057032