The BT8BTS Gooseneck coupler Lock set comes with the BT8T coupler lock and the BT8BL bolt lock.  This kit is designed for the new Gooseneck coupler utilized by BigTex trailer manufacturer.  The BT8T is the coupler lock and the BT8BL is the bolt lock to protect the coupler sleve from being removed and replaced. The BT8BL also provides a convenient place to store the BT8T coupler lock when you are towing the trailer. The BT8T lock slides down over the storage plate and locks in place, ensuring your coupler lock is always available and ready to lock and protect your trailer. Both locks are keyed alike when purchased in this set.