The AMP Lock Duo GN-B is a duo of 2x locks to protect Bulldog style Gooseneck mat. The duo contains an AMP Lock LBG to protect the gooseneck tube and an AMP Lock GN-B to protect the gooseneck mat. Both locks are keyed alike and can be order keyed alike with AMP Lock lock from Ultimate and Standard Plus Series. The duo comes with 4 keys total.