20pc Mounted Stone Grinding Bit Set - Fits Dremel Great value assortment of one of the most commonly-used rotary tool accessories - Now in a 20 piece set 10 unique shapes & sizes for superior versatility; cylindrical, wheels, cone, bull-nose Silicon carbide, aluminum oxide and other abrasive materials sintered & bonded on steel shanks Use for grinding, honing, sharpening, deburring and shaping most metals, glass, tile, ceramics 1/8" shank fits Dremel and other power rotary tools; average length 1-1/2"