BC cam gear clamping bolts are a direct replacement for any existing BC 2JZ/1JZ and 4G63/Evo cam gear and are made from ARP2000 material and feature a polished finish to eliminate corrosion and rust from handling and moisture. Hardened to RC 45-47, the BC clamping bolts feature a 12pt head for unlimited adjustment without stripping like the Allen style fastener that's commonly used.