Reese Elite 30137 Under-Bed Gooseneck Kit Two safety chain holders, hole cover and storage bag included Ball rated for 30,000 lbs. Capacity Lift and turn lever to unlock and remove ball Lever inside ball head activates ball bearing locking system Fits ford f-250 / f-350 / f-450 with factory installed OE rail system or Reese elite series aftermarket rails #30126, #30868, #30852