"The Trxstle Lock Body Clamp Kit fits with and locks the Trxstle CRC System Clamps (not included) into a closed position. What does this do? The Trxstle Lock Body Clamp Kit locks these clamps in place while they effectively act as a vehicle rooftop mount for your Trxstle CRC Fly-Rod Carrier (not included). In this position, your fly-rod carrier is locked in place to your vehicle's rooftop crossbars and is safe from would-be thieves. Kit requires 2.75"" of clearance beneath the vehicle's crossbars. Kit comes with everything you need to change the clamps into a keyed locking configuration. Kit includes 2 lock bodies with key cores, 2 hand knobs, and 2 keys. Locks your Trxstle CRC System (not included) Clamps in place Creates a key lock configuration Stops would-be thieves Includes everything you need"