Kincrome’s range of impact sockets are manufactured from Chrome Molybdenum (Cr-Mo) and feature a black phosphate finish for superior corrosion protection, laser etching foreasy drive size identification and Peripheral Drive™ technology. Peripheral Drive™ provides greater torque by relocation the load to the flat sides of a fastener, this allows for greater surface area contact and prevents “rounding off” of fasteners. IMPORTANT: Only Impact Sockets should be used on air or electrically operated power tools. NEVER use silver Chrome Vanadium Steel (Cr-V) Sockets which can shatter and cause personal injury.