These heavy-duty lockouts feature all steel construction, including Chrome-Moly internals, for the ultimate in durability & strength. The hubs will not disengage under high torque applications and defaults to the locked position under use. Engagement comes from just a 1/3 turn of the all-steel, low-profile bezel. The Yukon Hardcore locking hubs are not only great looking, but features a low-profile design to minimize impact with obstacles, and a proprietary coating on the locking gears for decreased friction & long life. Yukon Hardcore Locking Hubs come with a five year warranty against manufacturer's defect. This is a D44-19 locking hub kit assembly. This assembly fits 78 & Down GM D44, 78-92 Ford F150 & Bronco D44