Socket, 1 in Drive Size, 3 1/2 in Socket Size, 12-Point, Alloy Steel, Satin Finish/ OVERALL LENGTH: 5.125 INCHES NOMINAL WRENCHING END OUTSIDE DIAMETER: 4.688 INCHES NOMINAL DRIVE END OUTSIDE DIAMETER: 3.156 INCHES NOMINAL WRENCHING END OPENING DEPTH: 2.250 INCHES NOMINAL WRENCHING SURFACE SIZE: 3.500 INCHES NOMINAL SINGLE END DRIVE SURFACE SIZE: 1.000 INCHES NOMINAL SINGLE END FEATURES PROVIDED: MANUAL TOOL WRENCHING SURFACE SHAPE: 12 POINT SINGLE END INTERNAL DRIVE END SHAPE: SQUARE SINGLE END INTERNAL MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 168 INTERNAL-INTERNAL