Made In USA. Melling provides aftermarket camshaft bolt lock plate kits for specific applications. Camshaft bolt and lock plate kits prevent the camshaft bolts from loosening and therefore preventing costly valve train and engine damage. Easily installed by applying torque to bolts properly and bending the locking tabs in place to secure the bolts. Melling camshaft bolts and lock plates are manufactured to the most stringent specifications using only the highest quality materials and manufacturing processes to ensure maintenance free performance.