29-1/2 Aluminum Battery Box Toolbox Bottom Replacement Step Heavy Duty Bottom Battery Box Step Compatible with Peterbilt for 379 388 389. Packaged for Your Convenience: each package comes with 1 aluminum battery box toolbox bottom replacement step, 29.5 inches long, 7 inch wide, 14.4 inch long with mounting arms, compatible with Peterbilt 379, 388, and 389 Unrivalled Durability: made from aluminum, this battery box toolbox bottom replacement step showcases exceptional durability; The quality components are crafted from an alloy of aluminum, featuring an embossed plate for added strength; This ensures absolute reliability in all weather conditions Good Strength: Our toolbox bottom replacement step is much stronger than thin formed end plates welded from sheet metal, our brackets are not made with holes, which require cutting and drilling. If you prefer welded steps, please check out our welded steps Enhanced Accessibility: aside from providing safe storage, this tray assures quick and easy access to your essential equipment; It’s a strategic upgrade designed to boost your truck’s functionality, making it more efficient during road-trips or transporting assignments Greater Reinforcement with Robust Design: our battery/toolbox tray isn’t your typical product; It boasts thick riveted end plates, providing unparalleled strength compared to thin formed end plates welded from sheet metal; Designed with attention to detail, our brackets don’t have any holes, tfore you can weld and drill according to your needs. PLEASE MESSAGE US IF YOU HAVE ANY OTHER QUESTIONS, AND MANY THANKS FOR READING ALL OF THIS.