Manual Locking Hubs are unanimously recognized as the worlds toughest hubs by our thousands of satisfied customers worldwide. Brute strength matters, that is why the bodies of our hubs are crafted from impact resistant nodular iron, and feature a corrosion resistant die cast aluminum cap. Our hubs deliver better 4WD performance when locked and improved fuel economy in 2WD when unlocked, than automatic hubs. Purchasing a set a premium manual hubs is more cost effective than servicing your worn factory hubs. With the money you save youll be able to carry a spare set, not that youll need them. Sure you have to get out of the cab to lock the hubs, but unlike automatic hubs you wont have to wait until you lose traction for your four-wheel drive to engage.