Dremel 569 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 569: Bit Diameter: 1.6 mm Max speed: 18,000 rpm. Color Code: Red Description: Carbide Grout Removal Bit Shank Diameter: 3.2 mm Quanitity: 1 Model Number: 569 Order Number: 2615056932