Camshaft Engine Timing Locking ToolReducing Repair Time and Prevents Possible Engine Damage Due to Incorrect Timing! A one of kind cam shaft kit that works on most single, overhead engines. You'll be amazed by how effective this tool is at the maintaining the value time during belt replacement! Plus, this cam shaft tool totally reduces repair time and discourages damages to your engine when incorrect timing applied. Cover most single overhead cam engines, twin cam engines and quad cam