... steel,stainless steel ,alloy 2. Surface:Polished,Galv,Hot Dipped Galva. US type straight shackle 1. Material:Carbon steel,stainless steel ,alloy2 ... . Surface:Polished,Galv,Hot Dipped Galva.3. Size:Customer design ... .25276118.839163/4"-10UNC193/44.75317121.846197/8"-9UNC US type straight shackle