Alvin WRF38 King-Size Roll File; 4 Openings Make This Heavy Duty Storage Bin An Ideal Organizer For Rolled Maps, Plans, Drawings, and Tubes; 4 Swivel Casters for High Mobility Four 8" x 8" openings. Heavy-duty storage bin. The four swivel casters give it high mobility. Overall dimensions: 30"h x 17"w x 17"d.