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. This locking hub set will not fit housings with Bill of Materials numbers 610033-2; 3; 5 or 6.