Salco Products (SP112CS) 1 x 12-Inch (1"x12") Carbon Steel Seal Pin Assembly features a carbon steel seal pin that is 1-inch thick with 12-inches of usable length, and an overall length of 15-1/2-inches. The toggle (flapper) holds the pin in place, and features a 3/8-inch seal hole. Welded to the end of the pin is 17 links of 1/4-inch, carbon steel, chain with a length of 20-inches.