Axles come fully assembled Packed with High-Temp Axle Grease Underslung - Axle is welded with spring seats on the bottom Allows for lower ride height For optimal usage, use with single eye leaf spring High Strength Cambered Steel Axle Tube Construction to ensure Even Tire Wear A better highway experience Trailer Axle Design for use on Light Duty Trailers Utility Trailer Axle, Boat Trailer Axle, Car Haulers Trailer Axle, ATV Trailer Axle, Lawn & Landscape Trailer Axle, Motorcycle Trailer Axle, BBQ Pit Trailer Axle, Cargo Trailer Axle, Enclosed Trailer Axle, RV Trailer Axle & More Internal Wiring System To ensure seamless design Protect brake wires from wear and tear