These traction bars are laser cut from 1/4" thick steel, CNC formed and then mig welded. These include the replacement rear axle brackets and front frame mounts. All grade 8 and stainless steel hardware is included. This product will ship raw metal with no coatings. These were designed to fit the superdutys from 2008-2021 with 0-12" of lift. The common sterling 10.5 rear axle found on the 2008-2016 will have the 3.5" axle diameter. Some of the 2017+ F250 with Heavy Duty towing package and all of the 2017+ F350s will have a Dana M275 rear axle and need the 4" rear axle brackets. *Please double check prior to placing your order*. Please feel free to message us with any questions!