These threaded, coped steel bungs are 3/4 ” or 1” diameter and are drilled and tapped all the way through with your choice of 5/16 ”-18 or 3/8 ”-16 thread
Coped for a perfect fit on 1” tubing; tack in place, then weld it up; mounts are finished in minutes
3/4” bungs sold in 4-packs; 1” diameter bungs sold in 2-packs