Building a four link suspension for your new rock crawler? Putting together your own heavy-duty steering linkage for your trail rig? Tube inserts are a basic necessity for all DIY fabricators. RWO weld in bungs make it easy to fabricate adjustable linkages. Our race-style threaded tube inserts maximize the amount of the threaded shank of the heim inside of the tubing for ultimate strength. All of our tube inserts are available in left- and right-hand threading and are CNC machined, so they will fit perfectly every time. And we offer the most affordable prices on the market.