Features and Benefits: Common in automotive and computer industries; Designed for use in power drill chuck and chuck adapter; 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;