SUPERIOR GRIPPING POWER - Made of impact-resistant 42CRMO steel material (chromium-molybdenum steel), providing excellent durability and corrosion resistance. The thicker wall provides the strength required by the sleeve, The reverse spiral groove of the socket(the right-handed design of the internal torx thread) is designed to bite and provide maximum grip. provides a large bite to remove larger sized nuts or bolts. ACCURATE AND DIVERSE METRIC SIZES - 5-piece larger sized nuts or bolts. And sockets work on SAE/Metric sizes - 3/4(19mm), 13/16 (20-21mm), 7/8(22-24mm), 15/16(24mm), 1(25mm). Impact square drive all are 1/2 inch drive, for all kinds of job applications. WIDE RANGE OF APPLICATION -The drive end has a hexagonal surface and can be used with flat wrenches, pliers, adjustable wrenches, sockets or VISE-GRIP locking pliers. 1/2 "impact rated square drive, can be used with pneumatic tools. In addition, it can also be converted by a hex adapter for use wit