SL-1 2 5/16" DESIGNED FOR COUPLERS FLANGE WIDTH UNDER 4 1/8" CLOSE TOLERANCE FOR MAXIMUM SECURITY "MADE IN THE USA" Designed for NARROW 2-5/16" Coupler (RV) Designed for Standard 2-5/16" Coupler Designed for Bulldog Top Latch Coupler Must be under 4" Width Flange