Freestanding unit with vertical letter size compartments. Durable construction features a steel shell with 200-lb. test corrugated dividers and paperboard back. Compartment size: 4 7/8w x 12 1/2d x10 1/4h. Literature Sorter Type: Open Front Mail; Number of Compartments: 21; Compartment Size: 12 1/2″ x 10 1/4″ x 4 7/8″; Material(s): Steel.