Atlas Universal Adapter (UA) is designed for wheels that have either a closed center or wheels that are made "without a true center" and classified as lug-centric.
All Atlas wheel balancers come with a standard set of mounting cones which allow the operator to mount wheels that have a "true center". (This is the majority of wheels)
The Atlas UA was specifically designed for those custom alloy wheels that require a special mounting procedure. If your business is geared toward the high performance market, then the Atlas UA is the perfect option for your Atlas wheel balancer.