Salsbury Industries Aluminum 5-Door High Surface Mounted Cell Phone Storage Locker Unit with 20 A-Size Doors and Master Keyed Locks Standard "A" size doors (6-1/2" W x 5-1/4" H) and larger "B" size doors (13" W x 5-1/4" H) Available in 5" and 8" deep compartments; Mount directly to a wall and are secured with mounting hardware (not included) Each cell phone locker door includes a 2" W x 5/8" H clear plastic cardholder (card included) to identify the compartment; All openings are usable Cell phone lockers are available with master keyed locks or resettable combination locks Salsbury Industries is an ISO 9001: 2008 certified company and has excelled in the field of manufacturing since 1936