End Brush, End Brush, Bristle Type Crimped Wire, Brush Dia. 1/4 In., Abrasive Shank Size 1/8 In., Wire Dia. 0.005 In., Bristle Trim Length 7/16 In., Abrasive Material Stainless Steel, Max. RPM 37,000, Overall Length 2-1/4 In.