Impact Socket Extension, Alloy Steel, Black Oxide, Overall Length 6 in, Input Drive Size 3/8 in/ OVERALL LENGTH: 6.000 INCHES NOMINAL DRIVE SURFACE SIZE: 0.375 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