Salco Products (SP110CS) 1 x 10-Inch (1"x10") Carbon Steel Seal Pin Assembly features a carbon steel seal pin that is 1-inch thick with 10-inches of usable length, and an overall length of 13-1/2-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 21 links of 1/4-inch, carbon steel, chain with a length of 25-inches.