Manufactured to OE design ensuring each balancer will install properly and function as intendedDynamically balanced for proper absorption of the crankshaft vibrationsPrecision machined to zero runout providing smooth performance at all engine speedsIncludes woodruff keys making installation smooth and easy if original key is damaged or lostIndustry Leading Limited Lifetime WarrantyATP Graywerks Harmonic Balancers are a high quality OE replacement alternative. The parts are developed to the OE design, ensuring they will install properly and function as intended. This design is manufactured with high grade metals and rubber that is bonded or pressed per the original specifications. Each component is precision machined and assemblies are dynamically balanced for the best performance. Where needed, a woodruff key is included in the box to replace a damaged or lost piece. ATP Harmonic Balancers are backed by a Limited Lifetime Warranty.