【Impact Grade CR-MO Steel】Universal sockets, universal joint are made of heavy-duty chrome molybdenum steel, with black phosphate finish for durability.
【Premium CR-V Steel】Deep&standard impact sockets, torx sockets, inverted torx sockets, extensions, adapter are made from drop forged and heat treated chrome vanadium steel (50BV30).
【High-torque】Radius corner, 6-point design turns the flat sides of the fastener and provides maximum torque, while preventing the corners from damaging.
【Service Guarantee】All MIXPOWER Tools meet or exceed ANSI performance standards. It comes with 1 year quality guarantee.