16-Gauge Steel Adjustable Shelf Insert is an adjustable tray designed for use with Lund's steel underbody truck box. This shelf divides the compartment for increased organization and can be adjusted to one of three positions. Constructed of 16-gauge galvanized steel, this shelf assembles in less than 10 minutes. It also fits most competitors' underbodies. Backed by 30-years of experience and brand, this 16-Gauge Steel Adjustable Shelf Insert comes with a Limited Lifetime Warranty that protects against manufacturing and workmanship defects.