Bulldog 2-5/16" Ball Collar Lok with 3" Straight Tongue - 12,500lb Capacity Designed for utility, horse/livestock, cargo, and construction trailer applications, Bulldog Collar-Lok couplers are the strongest in the industry. The Bulldog design features the only automatic and continuously tight ball fit in the industry. A variety of coupler styles, tongue mounts, and latches allow configurations to match virtually any trailer. Easiest to use. Strong in both static and dynamic loading conditions. Hinged ball socket for easy hook up. Clear, visual indication of proper closure. High Pro-File latch for easy use 2-5/16" Ball size 3" Diameter square tongue 16 1/4" in length 12,500lb Capacity Weld-On 5 year Limited warranty