The Peterbilt 379 and 389 30 Inch Replacement Battery or Tool Box Bottom Step is a practical and durable solution for your Peterbilt 379 and 389 battery or tool boxes. Made from 1/8 inch thick diamond plate aluminum, this step is built to last. With a width of 29 1/2 inches and a depth of 7 inches, it fits most Peterbilt 379 and 389 battery or tool boxes. This replacement step is sold individually, making it a convenient and cost-effective choice for your truck. Upgrade your truck with this reliable and functional step today.