ARP Pro 12-Point Cylinder Head Bolt Kit includes hardened and parallel-ground washers that ensure even load distribution as well as accurate torque reading. This cylinder head bolt is cold-forged to ensure molecular integrity, heat-treated prior to thread rolling as well as machining and are rated at 200,000 psi. It delivers superior strength and meet the ARP “ZERO defects– ZERO failure” quality standard. This bolt is corrosion resistant and facilitates easy installation.