Number in Package: 4 pc. Material: Metal. SAE. Ratcheting. Size: Multi-Piece. Set includes: 3/8 in., 7/16 in., 1/2 in. and 9/16 in. Needs as little as 5 deg. of sweep to move a fastener thus allowing use in small clearance areas. Meets or exceeds ANSI and federal torque specifications. Surface drive box end virtually eliminates the rounding of fasteners. Mirror finished. Fully hardened.