Specification Brand : Crescent BulletPoint1 : Nickel Chrome plated for long lasting protection BulletPoint2 : Chrome Vanadium Steel BulletPoint3 : Mirror polish finish BulletPoint4 : Sockets feature Surface Drive technology to virtually eliminate fastener rounding BulletPoint5 : [Widely Use] - For disassembly and tightening of hexagon head bolts and nuts, especially suitable for requiring large torque and narrow space. The product has no insulation properties and is not suitable for electrical environments. CompatibleFastenerDescription : 0.5 inch DriveSystem : Square ExternallyAssignedProductIdentifier : 4953488157307 ExternallyAssignedProductIdentifier1 : 037103273918 ExternallyAssignedProductIdentifier2 : 0037103273918 ExternallyAssignedProductIdentifier3 : 00037103273918 FinishType : Polish Finish,Nickel Chrome Plated ItemLength : 1.5 inches ItemName : Crescent CDDS80 1/2" Drive, 21mm Deep Socket - 6 Point ItemPackageDimensions_Height : 12.446 centimeters ItemPackageDimensions_Length : 1.27 centimeters ItemPackageDimensions_Width : 2.794 centimeters ItemPackageQuantity : 1 ItemTypeKeyword : triple-square-drive-sockets Manufacturer : Apex Tool Group Material : Chrome Vanadium Steel MeasurementSystem : Metric MeasurementSystem1 : metric MeasurementSystem2 : inch ModelName : 4DB-30 ModelNumber : CDDS80 NumberOfBoxes : 1 NumberOfItems : 1 NumberOfPieces : 1 PackageLevel : unit PartNumber : CDDS80 ProductDescription : Made of chrome vanadium steel for strength and durability. With black phosphate finish, prevents rust and corrosion. Has a 6-point opening, it can fit tightly to the hexagon of the fastener head so that the maximum torque can be applied without slipping. To prevent round-off under stress, it grips the flat sides of the fastener head rather than the corners. The through-hole in the drive end locks onto the tang of impact wrenches or drivers so it won't fall off or stick on fastener heads. Widely used in DIY hand-making, household maintenance, and most general repairs. Specifications: Socket Size: 12mm Drive Size: 1/2-inch Total Length: 38mm / 1.5-inch Material: Chrome Vanadium Steel (CR-V) Finish: Black Phosphate Color: Black