ICONs Delta Joint is a heavy - duty high - angle ball joint that combines the durability of a ball joint with the performance characteristics of a traditional uniball. While the industry standard uniball does a great job of allowing the control arms of a vehicle to articulate with little bind, they do have an inherent weakness that leaves more to be desired when used in a daily driven application - exposure to the elements. The Delta Joints zinc plated housing provides the first layer of corrosion resistance, while a tough grease seal keeps potentially harmful elements out of the inner workings of the joint. Metal on metal construction and a greaseable design increase the longevity of the Delta Joint while also allowing for noise - free operation. What makes the Delta Joint unique is that it brings the best of both worlds to Non - ICON upper control arms with features that make it more robust than a uniball, and capable of greater angularity than a typical ball joint.