24. The ball mount was secured to the hitch with a 5/8-inch locking pin that was included in the Hitch Vault kit (PN: 1467DAT, $31.30). This mini vault is locked onto the hitch pin and provides a safe place for your keys, credit cards, and a small cell phone. Now we can drive our truck to the beach, ballgame, or hunting field without carrying our keys with us. The vault unlocks via a combination lock of our choosing.