Tube adapter made from chromoly steel. With a 1" outer diameter. Female style with left-hand 5/8-18 threads. Made with a .120 wall. QA1's weld-in tube adapters are CNC machined to precise tolerances from special easily weldable chromoly steel. Available in a large assortment of sizes to fit most popular tubing, they're an effective way to adapt rod ends to a variety of applications.