These threaded, coped steel bungs are 3/4″ diameter and are blind threaded (hole does not go all the way through) with 5/16″-18 thread. Coped for a perfect fit on 1″ tubing, tack in place then weld it up, mounts are finished in minutes. 1″ in length, measured from the top of the coped radius to the flat end. They are 1018 cold rolled steel for easy welding and are great for mounts of all sorts. Sold in 4 packs. Made in Ohio, USA