Salco Products (TC15N60P2A) 1-1/2-Inch Nitronic 60 Plug Assembly with Stainless Steel Chain consists of a plug that has 1-1/2-inch NPT threads, and is made out of Nitronic 60 material. The width across the flats of the head is 1-5/8-inches. The length of the thread is 1-1/32-inches with the overall length of the plug being 2-1/32-inches. Comes with a chain assembly that consists of a 1/4-inch, 18-8 stainless steel, swivel link that is crimped around the plug, and is connected to a 1/4-inch, 18-8 stainless steel, chain of 15 links with an approximate length of 19-inches.