Dremel 568 Grout Removal Kit
Easily attaches to Dremel rotary tool models 275, 285, 395, 398 and 780 in place of the housing cap. Has a 30-degree angle for controlled cutting along the grout line.  Two guides on the attachment to keep the bit centered between the tiles.  Large window for excellent visibility. The Multiple Slide Depth Adjustment in 2.5mm increment markings makes it easy to reference the depth of cut desired.