These tophat-shaped, blind threaded steel bungs are perfect for making gas tank and oil tank mounts, or for any other fluid filled vessel. Mild steel for easy weldability. 3/4″ OD with a 1″ OD flange that is 1/8″ thick. The overall length is 1″. Featuring a 3/8″-16 thread. Sold in 4 packs. Made in Ohio, USA.