Irwin Tools 351047XC Screwdriving Insert Bit, Phillips Drywall, 2 (10 Pack) Forged from high-grade S2 steel. IRWIN bits are between 58 and 62 on the Rockwell hardness scale IRWIN offers power drill and impact driver screwdriving bits for just about any application imaginable Works with Phillips head screws. Slightly longer bit head is ideal for drywall screws All IRWIN fastener drive bits are manufactured to meet ANSI Standards. Available in a wide variety of point sizes