Socket, 1/2 in Drive Size, 21/32 in Socket Size, 12-Point, Alloy Steel, Chrome Finish/ OVERALL LENGTH: 1.500 INCHES NOMINAL WRENCHING SURFACE SIZE: 0.656 INCHES NOMINAL SINGLE END DRIVE SURFACE SIZE: 0.500 INCHES NOMINAL SINGLE END FEATURES PROVIDED: MANUAL TOOL WRENCHING SURFACE SHAPE: 12 POINT SINGLE END INTERNAL DRIVE END SHAPE: SQUARE SINGLE END INTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 168 INTERNAL-INTERNAL SPECIFICATION/STANDARD DATA: 0U583-SAE AS954 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD NONDEFINITIVE SPEC/STD DATA: 1 TYPE AND 1 CLASS AND A STYLE