Miniature End Brush, Product Type End Brush, Quick Change System Not Applicable, Bristle Type Crimped Wire, Bristle Material Carbon Steel, Brush Dia. 1/4 in, Wire Dia. 0.005 in, Bristle Length 7/16 in, Grit Not Applicable, Overall Length 2 1/4 in, Compatible Tool Type Die Grinder, Drill, Impact Driver, Pencil Grinder, Straight Grinder, Color Silver, Primary Material Application Carbon Steel, Connector Type Shank, Connector Size 1/8 in, Operating Speed - Maximum 37,000 RPM