OEM Tools Phillips ACR Bits are manufactured with an Industrial S2-1Mod3 Alloy. The bit tips are cut using CNC Machines, insuring a perfect fit in the fastener head. With the use of a Cryogenic Tempering process, our bits will last up to 3X longer than S2 steel bits. Impact Rated for use in Corded and Cordless Electric Drills and Cordless Electric Impact Drivers