Birchwood Casey Target, Universal 2-IN-1 Gong Hanger, Fits On A Standard 2x4 Lumber Post BC-49052 Birchwood Casey Universal 2-In-1 Gong Hanger Fits On A Standard 2 X 4 Lumber Post. Hardened Steel Hook" Heavy Duty Powder Coated Finish And Includes Spring With Bolt. One Side Large Hook To Hang A Steel Gong. The Other Side Can Mount A Steel Gong With The Included Spring And Bolt For A More Audible Shooting Experience.