Molded to fit the specific shape of your fifth wheel when unhitched; Materials used by AMPLOCK provide good corrosion resistance for use in all climates; Easy to use with AMPLOCK’s push and lock system; The strongest lock to secure your fifth wheel made with high quality materials and control and identification key system; Protect your fifth wheel worry-free with the best king pin lock on market **Make sure you choose the right model for your fifth wheel size and type (pull rite or sidewinder) referring to pictures provided