AMP Research PowerStep XL Series features a rugged, bold design, offering an additional 3 lower stepping surface than the original PowerStepâ„¢. This product makes entering your lifted truck easier. The same automatic, electric-powered running board will instantly extend when you open your door and retract out of sight when your doors close. The rail is constructed of 6063 Marine-grade aluminum with an integrated bracket system with precision stainless steel pivot pins for rock-solid stability to support up to 600 pounds. PowerStepâ„¢ XL is maintenance-free with a self-lubricating bushing for all-weather performance and American designed and engineered.