The mobile bin storage unit is made in the USA and built for durability. It features a heavy steel frame with a flat top surface which can be used for additional work space. Four casters allow for maneuverability; two locking brakes for stability. Each of the eight grey polypropylene bins measure 12 1/4" x 16 3/4" x 3" (W x D x H). Any business will be more efficient with this mobile bin unit. Lifetime limited warranty.