Salco Products (TC1BPAH) 1-inch Brass Plug Assembly with Seal Hole and Stainless Steel Chain consists of a plug that has 1-inch NPT threads, and is made out of brass material with a 9/32-inch seal hole drilled through the head. The width across the flats of the head is 1-3/8-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 stainless steel 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.