NorthWest Steel Crafters Solid Mount Hitch Mud Flaps are extremely Heavy Duty, and will block all road debris that could harm your boat or trailer you are towing. With three Heavy Duty mud flaps across the back of your tow vehicle, you will surely stop loose rocks and gravel! Our Solid mount system has three mud flaps with Anti-Spray Grooves on the inside to also help cut down on highway spray. This is also an attractive unit, it comes with mirrored finish stainless steel anchor weights and reflectors. The center mount design allows you to slide the unit over all types of ball mounts, weight distribution shanks, and drop hitches with gussets. Simply slide the mud flaps over the end of your ball mount hitch. Then slide the mud flaps and ball mount into your receiver, insert hitch pin, and tighten down the locking bolt. Easy on and Easy Off! This model is for 2 1/2″ x 2 1/2″ receivers. We also have a model for the 2″ x 2″ receiver hitches.