005 in, Bristle Trim Length 5/16 in, Abrasive Material Carbon Steel, Face Width 3/16 in, Max.1 in, Mounting Type Shank, Arbor Hole Size No Arbor, Abrasive Shank Size 1/8 in, Wire Dia. Wire Wheel Brush, Wire Wheel Brush, Bristle Type Crimped Wire, Brush Dia.