Mobile file is extremely functional and versatile with wire steel construction. The cart is designed to accommodate letter-size or legal-size hanging folders and rolls easily on four 2" swivel casters (two locking) so you can slide the cart under a worksurface to open up floor-space. The bottom shelf can hold 100 lb. Mobile file holds up to 300 lb. and is made of 16-gauge steel with a powder-coat finish.