Product DescriptionThis is an essential adapter tool if you plan to work on the car or the wooden products around the house.Features: Converts 1/2 inch square female threads to 1/4 inch hex female threads for air or power impact wrenches.Quick release and safety lock design allows for quick bit changes and increases your productivity.The socket adapter kit comes with a rubber oring and a locking pin,which can help you better use the product.How to use 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 coming off the impact.Specification:Color: BlackMaterial: Chromium-vanadium SteelAdapter Size(L x W): Approx.50mm x 23mmFront Adapter Diameter: 6.35mm (1/4 Inch Hex Female)Back Adapter Diameter: 12.5mm (1/2 Inch Square Female)Package Contents:8 x Socket Adapter Set8 x Rubber O-Rings8 x Metal PinsOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.