This Is A Rough "n Tough Carbide Cutter (Fine Drum) from Robart. Features: Made of virtually indestructable tungsten carbide bonded on steel. Won"t wear out, load up, break down, or overheat. For use in shaping all woods, plastic, fiberglass and ceramics. Fine grit. Drum shaped. INCLUDES: One Carbide Cutter (Fine Drum) REQUIRES: Dremel High Speed Rotary Tool Mandrel SPECS: Diameter: 1/2" Comments: Not recommended for use on metal. kr10/22/01 ir/kh