Bobber Trailer Hitch Ball Cover Hitch Buds Fishing makes a great gift for fishermen and boat owners. Bobber hitch cover protects your trailer hitch ball from the elements, protects your shins from unnecessary bumps and bruises, and keeps you from getting grease all over your pants. Fishing bobber hitch cover measures 3.5" round and fits standard trailer balls from 1 7/8" up to 2 5/16". Once you've used this durable rubber float bobber hitch ball cover you'll ask yourself how you went so long without one.