This is Dremel"s 25/32" Silicone Carbide Grinding Stone Accessory Bit. FEATURES: A high-quality industrial abrasive made for extended usage. Ideal for sharpening, deburring, cleaning and general purpose grinding on harder materials--including stone, glass, ceramic, porcelain, gemstones, and nonferrous metals. Specially designed for working with flat and slotted surfaces. Use for all types of deburring, blending and finishing operations. INCLUDES: One Grinding Stone Bit REQUIRES: Rotary Tool SPECS: Stone Diameter: 25/32" (19,8mm) Shank Diameter: 1/8" (3,2mm) kr11/15/01 ir/kh