Model: 750E Capacity: 7,500 lbs. Maximum Tongue Weight: 750 lbs. Application: Drum Brakes Mounting: 3" wide tongues Coupler Size: 2" & 50mm balls Installation: Bolt-on Master Cylinder (included): 70519KD. Use only for hydraulic drum brakes. Fits 3" Wide Trailer Tongue ( 3" center-center mounting bolt holes). Fits a 2" ball.