All OEM Tools insert bits are CNC machine ground to exact tolerances; delivering a secure grip and maximum contact that eliminates stripping and slipping. Our patented HCH computer controlled heat treatment process produces superior through hardened impact rated insert bits. OEM bits are ideal for both high torque and heavy-duty impact applications. Independent testing results show the OEM bits will last up to 12x longer than standard bits, and deliver up to 50% increased torque.