These twist sockets are ideal for removing rounded and rusty bolts or nuts which are otherwise impossible to remove by a socket or wrench. Easy to use; Simply choose an appropriate socket from the seven provided. Using a hammer hit the socket onto the nut which is to be loosened then use a MANUAL wrench to loosen the nut anticlockwise. Use the straight rod to push out the end of the nut stuck in the socket. Note that this tool can only be useful for a nut with positive threads. Ideal for removing alloy wheel nuts when you have lost the key! Socket made of AISI4340 with HRC52-55 hardness Do not use Impact Drivers on these nuts. Specifications 7 1/2" DR Twist sockets 17mm, 18.5mm, 20mm, 21.5mm, 23mm, 24.5mm and 26mm High density Chrome Vanadium Black Phosphate finish Supplied in a blow moulded case