This is the industry standard IN-WALL mount night drop box. It comes with a self-closing hydraulic arm. This box is made of high quality steel construction with zinc coating, high quality automotive paint and special die cut decals. Looks great on the outside of your building. Front: 17-5/8" x 18-3/4"Back: 14" x 16"Depth: 4" Black steel with white lettering Packaged 1 per box Box Includes: 50 Standard envelopes Metal drop slot Chain mounted pen Durable steel box with pull-down tray for customer convenience to fill out envelope Due to various ways of mounting Night Drop Boxes, we DO NOT include mounting hardware. THIS IS AN 'IN-WALL MOUNT' DROP BOX. Item# 7325. For a self-contained night drop box, please see item #7320