Impact Socket, Socket Size 1 in, Socket Shape 12-Point, Drive Type Impact, Drive Size 1/2 in/ OVERALL LENGTH: 1.750 INCHES NOMINAL WRENCHING SURFACE SIZE: 1.000 INCHES NOMINAL SINGLE END DRIVE SURFACE SIZE: 0.500 INCHES NOMINAL SINGLE END FEATURES PROVIDED: POWER TOOL WRENCHING SURFACE SHAPE: 12 POINT SINGLE END INTERNAL DRIVE END SHAPE: SQUARE SINGLE END INTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 168 INTERNAL-INTERNAL