"The Tow Zone Hydraulic Drum Brake Actuator features a corrosion-resistant oversized master cylinder design that provides higher braking pressures for fast and smooth stops. Unique design incorporates shock dampener into master cylinder. Fits Trailer Tongue Size in. 3, Mount Type Bolt-on, Brake Application Drum, Breakaway Safety Device Yes, Built-In Lock-Out Yes, Weight Capacity lbs. 6,600, Fits Ball Size in. 2, Dimensions L x W x H in. 18 1/2 x 5 1/2 x 4 1/2. Built-in dampening shock absorber retards the telescoping shock against the hitch ball Actuator mounts directly to 3 in. wide tongues Coupler has a quick latch feature for safer operation PVC coated coiled emergency breakaway cable, stainless safety latch pin and grease fittings on rollers for easy maintenance 6,600-lb. capacity Bolt-on mounting Cast steel latch handle Quick Lock 2 coupler auto locks on the hitch ball in closed position Wide mouth master cylinder makes it easier to add brake fluid PVC coated galvanized cable features a smooth, corrosion-resistant finish Aluminum master cylinder is corrosion-resistant"