This retaining device is designed for positioning the camshaft in 30 degree TDC position.
The set A only used for left bank of cylinder and set B&C used for right bank (Apply for M275, M285).
Use the set B&C to loosen and tighten mounting screws for the camshaft sprocket and adjusting the timing (Apply for M137).
WARNING: California prop 65 - This product contains chemicals known to the state of California to cause cancer, birth defects or other reproductive harm. For more information go to https://www.p65warnings.ca.gov/