Heavy Duty 1/2 - 20 Tube Inserts 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 (1/2 20) for 3/4 ID tube for your custom job, or check out our full line of Barnes threaded tube inserts. Tube Insert Related Parts Barnes is your one-stop shop for quality 4WD fabrication parts. Search our line of 3 link suspension kits and 4 link suspension kits, Heim joints and Heim joint kits, jam nuts, and high misalignment spacers for all the parts you need for your custom job. Call us with your questions at (828) 551-7616 or email [email protected].