Blaylock American Metal Gooseneck Style Coupler LockThe safest way to secure most gooseneck style couplers including Bulldog, T. E. M., TEMCO, Hammerblow Cequent etc. Patented design ensures the most secure way to leave an unattended trailer. Crafted with pride in the United States of the highest grade aircraft aluminum. Fits all brands of gooseneck couplers For RV's, livestock haulers, heavy duty trailers Coupler and sleeve lock are crafted of high quality aircraft grade aluminum, EZ disk lock is