Dico Model 10 Hydraulic Surge Brake Actuator is zinc-plated for excellent corrosion-resistance. Bolts over 3" wide trailer tongue and includes standard, heavy-duty coupler with 3" drop 2 5/16" Ball Size. Built in 3" Drop; Breakaway kit included; Ball size: 2-5/16"; Mounting: 3" wide tongue; Mounting Holes on 3" and 5" Centers; Capacity: 12,500 lbs; Maximum tongue weight: 1,250 lbs;