About this item Heavy-duty Material : Each 21 mm socket 1/2″ drive is made of premium impact grade Chrome Molybdenum(CR-M0) Steel construction with corrosion-resistant black phosphate finish for durability.Further improved rotational capacity and wear resistance compared to CR-V steel material, which can withstand high torque from any drive. Radius Corner Design : Axle Nut Socket with 6-point side drive quickly clamp fasteners on flat surfaces, for precise installation without damaging fastener corners, avoiding slippage, reducing wear, and providing high torque. Each impact sockets has highly visible laser-etched marking for easy identification even in low light conditions. Highly compatible : The 21mm socket 1/2 drive is made to work with power impact wrenches or impact driver. Just make sure the deep socket can be compatible with your tool, whether it’s a pneumatic impact wrench, an electric impact wrench, a ratchet, or any other kind of tool that turns. Easy To Use : 1/2″ drive, 21mm 6-point socket, meet & exceeds ANSI performance standards,package include 1 piece 21mm socket. Save your energy by using our professional-grade impact socket set that allow you to easily remove remove or install axle nuts on front-wheel drive vehicles. Ideal Choice : This 21mm lug nut socket is ideal choice for any Home maintenance, Garage and Automobile repair, DIY home improvement. we have full confidence in our socket products and believe that they can improve your work efficiency and become a reliable assistant in your daily life.