Pop-In Ball -Lever inside ball head activates ball bearing locking system -Lift and turn lever to unlock and remove ball Two safety chain holders Hole cover keeps Pop-In Ball sleeve free of debris Storage bag included Ball rated for 30,000 lbs. capacity Fits Ford F-250 / F-350 / F-450 with factory installed OE rail system or aftermarket rails (#30126, #30852 & #30868) Patents Pending