Key Drop Box 201980001, Key Differently, Durable Gray Steel Construction. Drop the keys into the slot opening on top of the box. Slot opening measures 2 1/2" X 1/2". Only an authorized person with the keys to the drop box can retrieve them. Mounts on carts, walls, and doors. Key lock comes with two keys. Master keying available at additional charge. Size 4-3/8" W X 7-1/4"H X 3-1/4"D. Color:Gray. These boxes are keyed differently so if you buy multiple boxes the same key won't work on all of the boxes.