Quick release and safety lock design allows for quick bit changes and increases your productivity. Product This is an adapter tool if you plan to work on the car or the wooden around . Features: Converts 1/2 inch female threads to 1/4 inch hex female threads for air or impact wrenches. The socket adapter kit comes with a rubber oring and a pin,which can help you better the product. How to the pin and o ring The o ring goes around the socket adapter in the groove and holds the pin in place, like a buffer on the drill shaft and indentation to keep it from off the impact. Specification: Color: Black Material: Chromium-vanadium Steel Adapter Size(L x W): .50mm x 23mm Adapter Diameter: 6.35mm (1/4 Inch Hex Female) Back Adapter Diameter: 12.5mm (1/2 Inch Female) Package Contents: 8 x Socket Adapter Set 8 x Rubber O-Rings 8 x Metal Pins Only the above package content, other are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm. How to the pin and o ring The o ring goes around the socket adapter in the groove and holds the pin in place, like a buffer on the drill shaft and indentation to keep it from off the impact. Specification: Color: Black Material: Chromium-vanadium Steel Adapter Size(L x W): .50mm x 23mm Adapter Diameter: 6.35mm (1/4 Inch Hex Female) Back Adapter Diameter: 12.5mm (1/2 Inch Female) Package Contents: 8 x Socket Adapter Set 8 x Rubber O-Rings 8 x Metal Pins Only the above package content, other are not included. Note: Light reflection and different displays may the color of the item in the a little different from the real . The measurement allowed is +/- 1-3cm.