This Lisle Brake Caliper Bit Set (12550) includes 6 bits for servicing brake calipers. The bits are made of heat-treated, chrome-moly steel and feature a 1/4 hex shank for use in a drill or air tool. The set includes a Phillips #2, Phillips #3, T-30 Torx, T-40 Torx, 5/16 Hex and 3/8 Hex bit.