The ring and body of this unusually strong car is investment cast of 17-4 heat treated stainless steel to provide a superior product. Compatible with our ?UXP?and ?UTR? pole end fittings. Ring I.D. is 1-5/8?. The RC-125 is for 1-1/4? T-track and has a screw lock-pin, our special UHMW polyethylene slides inserts and provisions for up and downhaul shackles.