Barnes offers the most affordable high-quality weld in bungs on the market. Built race style for maximum strength, our tube inserts allow for the largest amount of threaded shank of the Heim inside the tubing. Available in both left hand and right hand, choose our heavy duty tube inserts (3/4 - 16) for 1” ID tube for your custom job, or check out our full line of Barnes threaded tube inserts.ID = 1" OD = 1-1/4" Tube adapters are a basic necessity for every DIY Fabricator. No matter if you are building a four link set up for you new rock crawler or you own heavy duty steering linkage for your trail rig you have to have them. These weld in inserts make it easy to fabricate adjustable linkages. All of our tube inserts are CNC machined.