MATERIAL: 45# CARBON STEEL WITH CHROME PLATED; APPLICATION: TO LOCK TWIN CAMSHAFTS TO TIMING, MARKS DURING BELT REPLACEM ENT, FITS ON TO SPROCKETS AND EXTENDS TO LOCK INTO SPROCKET TEETH, ADJUSTABLE ARMS TO FIT VARIOUS DIAMETERS AND TEETH PI TCHES, FOR LOCKING BETWEEN CAM AND DIESEL INJUNCTION PUMP SPROCKETS