Reese custom built trailer ball mounts feature solid all-welded construction for maximum strength and safety. The patented interlock one wrench tightening system allows for one handed tightening is a breakthrough when compared to the traditional dual wrench flat hitch ball design, which required two hands, and two wrenches. Reese offers the high level of testing that these bars are subject to, and with fatigue and stress testing, it ensures a strong design that will withstand road abuse. Available on Class II and III ball mount bars.