This is a BRAND NEW set of Ladder/Traction Bars for the 99-06 Chevy/GMC 1500 4x4. They are being offered by Top Gun Customz. These are bolt on and work with up to 6" of lift. These are a must especially if your truck is lifted. Will work with gas or diesel and all cab configurations (standard cab, extended cab, and four door). Tuff Country ladder bars help to reduce axle hop or wrap, thus providing increased traction and acceleration by maintaining tire contact with the road. These are bolt-on.