Alvin WRF34 wire bin roll file cart features 4 square openings (each 8" x 8"). This heavy-duty storage bin an ideal organizer for rolled maps, plans, drawings, and tubes. Great for blueprint storage, mailing tube organization. 4 swivel casters give it high mobility. Constructed of white plastic-coated heavy-gauge wire. Overall dimensions: 30" high x 17" wide x 17" deep. Supplied with custom-fitted bottom dust protector. Includes illustrated assembly instructions. Tubes shown in photo not included.