This weldable threaded insert makes custom link building simple and easy. Weld the insert to control arm length tubing. Weldable inserts are available to fit our large (1-1/4” 12 tpi.), medium & small (7/8” 18 tpi.) Monster ends. The large inserts require a minimum of 1.5” ID tubing and the medium/small inserts require a minimum of 1-1/8” ID tubing. Sold Individually.