The 3" stainless steel steptube is the most popular choice in a vehicle running board or step. Available from a wide variety of manufacturers, the 3" steptube (or nerf bar) can be either cab length or wheel-to-wheel in style. The steptubes all use 'No-Drill' installation, have powder coated mounting brackets, and are made of either high quality 304 stainless steel or black powder coated carbon steel. One of the most economical and stylish choices for many vehicles.