The new innovative Weigh Safe Clam Shell Tow Ball Adapter converts most 2 Inch tow balls into a 2-5/16 Inch tow ball which can be used on most bumper pull systems. This Design was pioneered by Weigh Safe, LLC to both simplify and safeguard your towing experience. With the Weigh Safe Clam Shell Tow Ball Adapter, you can rest assured that you will always have the correct-sized tow ball to haul your load.