Camshaft Engine Timing Locking ToolRepair Engines Safely and Quickly! This universal kit covers most overhead cam engines. The four cam engine lock camshaft will maintain valve time during the replacement of the belt. It will reduce repair time while preventing engine damage. It's suitable for gears from 4 inches ( 101 mm ) to 6 inches ( 152 mm ) in diameter. The distance is 1 16 inch (1. 6 mm) to 3 inches (76 mm). FEATURES: EASY TO USE The compact design makes it easy to work in small