Nerf bars were originally designed to protect vehicles from lower body damage, but they have evolved to serve other purposes as well. Many truck and SUV owners want Nerf bars just for the way they look ? these sleek, tubular side bars make a stylish statement on almost any rig. These Nerf bars also function as side steps, creating an easier and safer entry point into the truck / SUV. Fit 99-13 GMC Sierra 1500 Extended Cab/99-13 Chevy Silverado 1500 Extended Cab/99-14 GMC Sierra 2500 3500 Extended Cab/99-14 Chevy Silverado 2500 3500 Extended Cab