**Screw Features** *Manufactured to SAE J78-1979 and independently tested to IFI specification ASTM C1002-89.|*No 2 Drill Point|*Surface hardened up to 650 HV to prevent torque shearing under load and a core hardness of up to 400 HV for improved ductility.|*Made from C10-18 Steel.|*Cosmetically plated in zinc.