Salco Products (SP504CS) 1/2 x 4-Inch (1/2"x4") Carbon Steel Seal Pin Assembly features a carbon steel seal pin that is 1/2-inch thick with 4-inches of usable length, and an overall length of 5-1/32-inches. The toggle (flapper) holds the pin in place, and features an elongated 3/16-inch seal hole. Welded to the end of the pin is 13 links of 3/16-inch, carbon steel, chain with a length of 12-inches.