Westin E-series step bars are a high quality 3 - inch diameter 304 stainless steel or black powdercoat mild steel step bar that has a no drill installation and is preferred by quality installers. Installation varies by vehicle and detailed installation instructions are included. Westins E-Series step bars are designed to bolt on to the factory provided mounting points. Due to the numerous body mount configurations, the step bars may be rounded or straight on one end. Some products may differ slightly from image.