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 in. diameter and offers a gross trailer weight capacity up to 30,000 lb. At CURT, we know the demands that come with a hard-working lifestyle: the noise of the construction site, the long hours behind the wheel of a tractor, the potential dangers of high-powered equipment. You should expect your towing equipment to endure when facing the same demands. With our tried and true designs and knack for innovation, CURT proudly offers its extensive line of gooseneck hitches, knowing they will never steer you wrong.