PH3 Phillips - 1" Impact Rated Insert Bit- 20 Pack - BluSteel FREE SHIPPING SAME DAY ON ALL ORDERS IN BY 3:00 PM - NO MINIMUM Impact rated for Cordless Electric Drills - Premium S2-1Mod3 steel. CNC cut for High Torque Impact applications HCH Through-Hardened tempering process. Manufactured to ASME B.107 Standards