Socket, 3/8 in. Dr, 20mm Hex/ OVERALL LENGTH: 30.1 MILLIMETERS NOMINAL WRENCHING SURFACE SIZE: 20.0 MILLIMETERS NOMINAL SINGLE END DRIVE SURFACE SIZE: 0.375 INCHES NOMINAL SINGLE END FEATURES PROVIDED: MANUAL TOOL WRENCHING SURFACE SHAPE: 6 POINT SINGLE END INTERNAL DRIVE END SHAPE: SQUARE SINGLE END INTERNAL SPECIAL FEATURES: STANDARD LENGTH MATERIAL: STEEL OVERALL SURFACE TREATMENT: CHROMIUM OVERALL STYLE DESIGNATOR: 168 INTERNAL-INTERNAL SUPPLEMENTARY FEATURES: INDUSTRIAL QUALITY (IQ) TOOLS PROGRAM ITEM