These weld-in threaded tube adapters are perfect for construction of linkage and suspension components. Pro-werks  adapters are precision CNC machined 4130 chromoly to exacting  tolerances with a  Jewelry quality finish. Available in both Right or Left hand thread configurations . Left hand tube adapters are conveniently marked with grooves for easy identification during assembly . The LH grooves are conveniently is hidden after fabricating , for a clean finished assembly. Proudly made right here in the USA.