Salco Products (TC075N60PA) 3/4-inch Nitronic 60 Plug Assembly with Stainless Steel Chain consists of a plug that has 3/4-inch NPT threads, and is made out of Nitronic 60 material. The width across the flats of the head is 1.06-inches. Length of the thread is .60-inches with the overall length of the plug being 1.13-inches. Comes with a stainless steel chain assembly that consists of a 1/8-inch, 304 stainless steel, swivel link that is crimped around the plug, and is connected to a 1/8-inch, 18-8 stainless steel, chain of 12 links.