Irwin Tools 93373 Screwdriving Power Bit, TORX, T40, Single Forged from high-grade S2 steel. IRWIN bits are between 58 and 62 on the Rockwell hardness scale Power bits are screwdriving bits that are longer to work with both power drills and impact drivers TORX screws, also called star drive, are commonly used on automobiles, motorcycles, bicycles, computers, and consumer electronics All IRWIN fastener drive bits are manufactured to meet ANSI Standards. Available in a wide variety of point sizes Made in the USA from global components