Extra heavy duty shelf occupies just one rack space. Supports up to 100 pounds with a safety factor of 100% if properly secured. Shelf is of 14-gauge steel, and finished in black baked enamel. Extra heavy-duty ball bearing sliders extend a full 14" for a usable surface area of 16" wide x 14" deep. Sliders equipped with a positive lockout mechanism that stops in two positions. Rear rack rail provided.