Radius Style Threaded 3/8-16 and 5/16-18 Steel Bungs by TC Bros.Save time and create professional quality mounts using these blind threaded radius bungs. Perfect for mounting fenders or anything where a clean, finished appearance is desired. Proudly made in the USA from premium American 1018 cold rolled steel for easy welding. 3/4" diameter x 1-1/4" long or 1-3/4" long.