High Quality Made of high-quality steel with good mechanical properties, strong corrosion resistance and durability, and long service life. Function Fix the camshaft on T.D.C. When servicing cams, gears, chains, etc., ensure correct timing and prevent rotation. Purpose When servicing cams, gears, chains, etc., keep the camshaft at the top dead center to ensure correct timing, and position at the end of the camshaft to prevent rotation without disturbing the timing. Substitution Substitute for KMJ44221, for OTC-J-44221 Service Quality .