Impact Socket Extension, Alloy Steel, Black Oxide, Overall Length 2 in, Input Drive Size 1/2 in/ OVERALL LENGTH: 2.000 INCHES NOMINAL DRIVE SURFACE SIZE: 0.500 INCHES NOMINAL BOTH ENDS FEATURES PROVIDED: POWER TOOL DRIVE END SHAPE: SQUARE FIRST END INTERNAL DRIVE END SHAPE: SQUARE SECOND END EXTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: OXIDE OVERALL STYLE DESIGNATOR: 69 RIGID SPECIFICATION/STANDARD DATA: 05047-ASME B107.2 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD NONDEFINITIVE SPEC/STD DATA: 4 TYPE