Features and Benefits: Common in automotive and computer industries; Torxr is a registered trademark of Acument Intellecutal Properties LLC; Power bits are screwdriving bits that are longer to work with both power drills and impact screwdrivers; All IRWIN fastener drive bits are manufactured to meet ANSI standards.; Forged from high-grade S2 steel, IRWIN bits are between 58 and 62 on the Rockwell hardness scale.; Specifically designed for the higher torque requirements of power tools. Best suited for maintenance and repair work. Common in automotive and computer industries. TORX is a registerd trademark of Acument Intellecutal Properties LLC.