Impact Socket Adapter, Black Oxide, Locking No, Output Drive Male, Square, 3/4 in/ OVERALL LENGTH: 2.000 INCHES NOMINAL OUTSIDE DIAMETER: 1.563 INCHES MAXIMUM DRIVE SURFACE SIZE: 0.625 INCHES NOMINAL FIRST END DRIVE SURFACE SIZE: 0.750 INCHES NOMINAL SECOND END 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: 6 EXTERNAL-INTERNAL