RUGGED RIDGE MANUAL LOCKING HUBS, SET OF 2 -- Each manual hub features a military-specification hardened nylon center dial that prevents damage to internal parts in the unlikely event of axle breakage, precision machined and heat treated internal components, a die cast aluminum cap with corrosion resistant glossy finish, and a salt-spray tested epoxy enamel finish for the hub body; Improves 4WD performance when the hubs are locked; Reduces drive train noise and vibration; Provides better fuel economy due to the lesser drag on the engine, more mileage for the front tires since they will rotate freely, and a more comfortable ride due to lightened steering.