The Luxor Single-Row Storage Cart is a dependable, affordable solution for storing a variety of items. Four 6" deep tubs are made of tough polypropylene and can hold up to 20 lbs. The steel frame and sturdy guardrails provide long-lasting durability. Smart design Features such as a built-in safety feature that prevents drawers from accidentally being removed, a mix-and-match rack system that also fits Luxor 3" tubs (sold separately), and rolling casters with two locking brakes, make this utility cart a great fit for classrooms, service facilities, workshops or anywhere requiring a mobile storage solution.