Features: -Includes master commercial lock with 2 keys. -Made entirely of aluminum. -Doors and trim are striated to resist scratching. -Units include a fully integrated flanged collar which fits over the rough opening. -Fits into a rough opening and are secured with mounting hardware (not included) through the back or side panels. -Ideal for colleges schools private postal centers corporate mail centers military bases government agencies and many other applications. Primary Material: -Aluminum. Dimensions: -Rough opening for recessed mounted vertical mailboxes is 1.5 less than the unit s width 1.25 less than the unit s height and equal to the unit s depth. -Individual compartment: 16.25 H x 5.5 W x 6.75 D. Overall Height - Top to Bottom: -19 . Overall Width - Side to Side: -18.75 . Overall Depth - Front to Back: -7.5 . Overall Product Weight: -25 lbs. Specifications: Certifications: -Yes. Commercial OR Residential Certifications: -Yes.