Ultra-Tow 3,500-Lb. Capacity Spring Trailer Axle with Adjustable Spring Mount... Beam only flanged design can be used as an idler or brake axle Adjustable spring mounts offer a variety of mounting positions Fast Lube spindles allow you to re-grease the bearings without removing the hubs Stainless steel wear sleeves prevent rust from wearing on the rubber oil seal 2in. square tube steel axle is hot dip galvanized with adjustable spring centers