Ratchet Adapter, Drive Size 3/4 in, Overall Length 3 3/4 in, Number of Pieces 1/ OVERALL LENGTH: 3.688 INCHES NOMINAL DRIVE SURFACE SIZE: 0.750 INCHES NOMINAL BOTH ENDS DRIVE END SHAPE: SQUARE FIRST END INTERNAL DRIVE END SHAPE: SQUARE SECOND END EXTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 147 EXTERNAL-INTERNAL