Audiovox Automotive Floorboard Transmission Lock
You are buying six 1 brand new automotive internal gear shift/floorboard transmission locks made by Audiovox. It is their Prestige Brand and is part number APS-BLU1-13. They have a locking rod which is ~ 3 inches long. Mounting hardware, three keys and an installation sheet are included. I'm sure there are probably other applications in which these can be used.
Check out the pictures for the locks, the box and the instruction sheet.