3" x 1/4" x.008", Crimped Wire Cup Brush, Fine, 1/4" Hex Shank, .008" Wire Size, Ideal For Light Duty Cleaning Action, Typical Applications Include Removal Of Dirt, Rust, Paint, Scale and Weld Spatter, For Use On Portable 1/4" Diameter Electric Or Air Tools, Cordless Or Pneumatic Drill.