1/8", Carbide Grout Removal Bit, Use With Grout Removal Attachment, Removes Wall & Floor Grout 3/8" Below The Face Surface & Will Not Damage Tiles.
From the Manufacturer
The Dremel 570 1/8-Inch Carbide Grout Removal Bit is ideal for replacing wall and floor grout or removing grout to replace broken tiles. This bit removes wall and floor grout 3/8-inch below the face surface without damaging floor tiles. Designed for use with Dremel No. 568 and 962-01 grout removal attachments, this high-speed cutter has a 1/8-inch diameter steel shank.