Mr. Gasket Harmonic Balancer Bolt is made from grade 8 alloy material. This bolt is efficiently heat-treated to provide superior strength. It features a high hex head to prevent slippage that occurs while rotating the engine when degreeing a cam or while adjusting the valves. An extra thick, parallel ground washer is provided with the bolts to facilitate a more accurate, uniform torque. It comes complete with split lock washer to prevent loosening caused by vibration.