This is Dremel"s 1/2" Bristle Brush Accessory Bit. FEATURES: A wheel-shaped brush with long-wearing nylon bristles. Ideal for general cleaning and polishing most surfaces. Great on flat surfaces. Its nylon bristles make it great for polishing silverware, jewelry, and other precious metals. This bristle brush can be used with polishing compound (DRER1355). INCLUDES: One Bristle Brush Bit REQUIRES: Rotary Tool SPECS: Brush Diameter: 1/2" (12.7mm) Shank Diameter: 1/8" (3.2mm) COMMENTS: Do not run in excess of 15,000 RPM. Therefore, do not use with a Single-Speed MultiPro Rotary Tool or Heavy-Duty Flex-Shaft Tool unless you use the Foot Speed Control kr11/14/01 ir/kh