Dremel accessory (8215) aluminium oxide grinding stone is designed for grinding, sharpening and deburring on various materials Made from aluminium oxide for precision grinding and increased durability Ideal for deburring metal after cutting, smoothing welded joints, grinding off rivets and removing rust, also suitable for sharpening knives, scissors, lawn mower blades Working diameter 25.4 mm; shank diameter 3.2 mm; recommended maximum speed 20,000 RPM Fits with all Dremel Multi-/Rotary tools or other 3,2mm shank size multi- / rotary tools, Weight: 0.0220462262 pounds, Manufacturer: Dremel