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 Limited Lifetime warranty against manufacturer's defect. Product Features:Fits 1978 and down GM Dana 44 and 1978-1992 Ford Dana 4419 splineAll steel constructionChromoly internals for added strengthLow profile bezel to reduce impact with obstaclesDefaults to locked position1/3 turn from disengaged to engaged