Impact Socket Extension, Alloy Steel, Black Oxide, Overall Length 3 in, Input Drive Size 3/8 in/ OVERALL LENGTH: 3.000 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