Chicago Pneumatic impact wrench sockets are made from Chrome-molybdenum Steel and have a Phosphate Manganese surface finish for extreme wear resistance, maximum torque, and preventing fastener rounding. They are designed to support and absorb the momentary shock of each impact, therefore preventing cracks or breaks, and prolonging the life of the socket. The sockets have a cross hole in the handle end, making them compatible with a retaining pin and ring, or locking pin anvil. To keep your CP tools performing optimally and reliably, we advise the use of Chicago Pneumatic Genuine accessories. From drill bits to impact wrench sockets, Chicago Pneumatic offers a wide range of accessories to meet all your needs.