AJK Offroad machines our tubing clamps / 6 bolt couplers in house. Our tubing couplers use six 1/4-28 SHCS to hold the two halves together. These steel mounting brackets can be mounted to your roll cage for removable tire carriers, racks, light bars, mirrors or anything else that you may want to remove from your off road rig from time to time. Many people drill and tap these clamps to mount mirrors, light bars, steering rams, or any other accessory.