While the basic CURT gooseneck ball offers all the towing power needed for towing that heavy-duty flatbed trailer, a standard trailer ball does not always provide the perfect fit for your unique application. The CURT Double Lock gooseneck riser ball offers a quick, easy way to raise your gooseneck coupling point whenever necessary. It uses the same dual-pin locking system for a secure installation and is compatible with all CURT Double Lock gooseneck hitches. The gooseneck riser ball simply slides into the trailer ball hole, locks into place and provides an additional inch of clearance, giving your gooseneck trailer the extra room it needs to avoid damage to your pickup truck bed. The Double Lock gooseneck riser ball features a standard 2-5/16″ diameter and offers a gross trailer weight capacity up to 30,000 lbs.