Specification Brand : HARFINGTON BulletPoint : IMPACT REDUCER, Black Phosphate, Locking No, Output Drive 3/4 in (F) Square, Output Drive Shape Square, Output Drive Size 3/4 in, Output Drive Gender Female, Impact, Input Drive 1 in (M) Square, Input Drive Shape Square, Input Drive Size 1 in, Input Drive Gender Male BulletPoint1 : Size - 3/4" Drive; 21mm Square Impact Socket; Total Length: 80mm / 3.15"; Package Includes: 1 x 4 Point Square Socket. BulletPoint2 : Material - 4-point drive socket is made of high hardness 40CR steel forging, which has excellent impact resistance and wear resistance, is not easy to deform or damage, and is suitable for working environments with high torque. The blackening surface is frosted, helping to prevent rust and corrosion, thereby extending the tool's lifespan. BulletPoint3 : Feature - The port of the impact socket adopts a 4-point square structure, which can better fit the square head of the screw or nut, providing a stronger grip when used, preventing the fastener from becoming round, and is not easy to slip. The anti-drop hole design of the base can help the socket be fixed on the tang of the pneumatic wrench or driver to prevent the pin from falling off, making it safer to use. BulletPoint4 : Application - The specifications of the square socket are engraved on the surface and are clearly visible. You can quickly switch between different socket sizes while working to improve work efficiency. Square wheel sockets are widely used for removing and tightening square head bolts and nuts of various structural fasteners. Suitable for automotive repair, DIY handcrafting, construction, and machinery maintenance. BulletPoint5 : Notice - Please make sure that the selected socket size matches the head of the screw or nut to avoid slipping or damage due to size mismatch; please use a professional wrench or torque wrench to match the socket to avoid affecting torque transfer or damaging the socket; when using a socket tool to tighten or remove screws, apply force evenly and appropriately to avoid excessive force that may cause damage to the socket or thread. Color : Black CompatibleFastenerDescription : 0.75 inches DriveSystem : Square ExternallyAssignedProductIdentifier1 : 0779768281890 ExternallyAssignedProductIdentifier2 : 779768281890 FinishType : Galvanizing GpsrSafetyAttestation : 1 ItemLength : 2.57 inches ItemName : HARFINGTON 4 Point Square Socket 3/4" Drive by 21mm Metric Square Impact Socket 40CR Blackening Standard Wheel Sockets Pneumatic Socket Tool for Auto Repair Mechanical Maintenance Home Use ItemPackageDimensions_Height : 1.77 inches ItemPackageDimensions_Length : 5.51 inches ItemPackageDimensions_Width : 3.94 inches ItemPackageQuantity : 1 ItemTypeKeyword : square-drive-sockets Manufacturer : HARFINGTON Material : Alloy Steel ModelName : IMPACT REDUCER ModelNumber : 49-66-6731 NumberOfBoxes : 1 NumberOfItems : 5 NumberOfPieces : 1 PartNumber : hta241118hh000040 ProductDescription : 4-point drive socket is made of high hardness 40CR steel forging, which has excellent impact resistance and wear resistance, is not easy to deform or damage, and is suitable for working environments with high torque. The blackening surface is frosted, helping to prevent rust and corrosion, thereby extending the tool's lifespan. The port of the impact socket adopts a 4-point square structure, which can better fit the square head of the screw or nut, providing a stronger grip when used, preventing the fastener from becoming round, and is not easy to slip. The anti-drop hole design of the base can help the socket be fixed on the tang of the pneumatic wrench or driver to prevent the pin from falling off, making it safer to use. The specifications of the square socket are engraved on the surface and are clearly visible. You can quickly switch between different socket sizes while working to improve work efficiency. Square wheel sockets are widely used for removing and tightening square head bolts and nuts of various structural fasteners. Suitable for automotive repair, DIY handcrafting, construction, and machinery maintenance. Please make sure that the selected socket size matches the head of the screw or nut to avoid slipping or damage due to size mismatch; please use a professional wrench or torque wrench to match the socket to avoid affecting torque transfer or damaging the socket; when using a socket tool to tighten or remove screws, apply force evenly and appropriately to avoid excessive force that may cause damage to the socket or thread.