Check the listing for details. Square Impact Socket 1" Square Drive 21mm Socket for DIY Repairs. Condition: New. Listed at 30.66 USD. Attributes:* Socket Size: 21mm* Square Drive Size: 1-inch* Total Length: 80mm/3.15-inch* Material: Chrome Vanadium Steel (CR-V)* Finish: Black Phosphate* Color: BlackWhat Is Included:*1 Piece x Square Impact SocketsApplications & Features:--- Suitable for requiring large torque and narrow space, the square impact socket is widely used in DIY hand-making, household repairing, industrial manufacturing, and automobile repairing--- Radiused corners prevent fastener wear and extend the life of the fastener. The separate pinhole base design provides added security by placing a locking pin that maintains stability when strong torque movements are applied.Useful Tips:--- The product has no insulation properties and is not suitable for electrical environments.