Melling camshaft sprocket actuators are constructed from high quality durable steel and shipped with the mounting bolt that attaches the cam shaft phaser to the cam shaft. Camshaft sprocket actuators (Also known as variable valve timing sprockets) adjust the timing of the motor to ensure that you get the engine power you need when you need it. The sprocket actuator dials the timing back when you don’t require the additional power, restoring fuel economy and maintaining engine efficiency. Melling camshaft sprocket actuators are quality manufactured to assure a proper installation every time and precision engineered for dependable, worry free operation.