End Brush, Product Type End Brush, Quick Change System Not Applicable, Bristle Type Crimped Wire, Bristle Material Stainless Steel, Brush Dia. 1/2 in, Wire Dia. 0.014 in, Bristle Length 1 in, Grit Not Applicable, Overall Length 2 3/4 in, Compatible Tool Type Straight Grinder, Drill Press, Pencil Grinder, Color Not Applicable, Connector Type Shank, Connector Size 1/4 in, Operating Speed - Maximum 25,000 RPM, Series Gemini