SL-3 Trailer Security Lock for 2 5/16 Designed for INVERTED JAYCO WIDE FLANGE COUPLER AND 2-5/16" BULLDOG COUPLER MFG IN DALLAS, TXF All Steel Fabrication (Welded Steel 2 5/16 Trailer Ball) Perfect Fit for Jayco Wide Flange Designed for Most 2 5/16 over 4 1/4" to 5" Stainless Steel (Cut-proof and Freon Resistant Lock Included for maximum Protection) Make sure your Trailer is where you left it... "Made In The USA"