DuraBox Wall Mount Locking Deposit Drop Box Safe (W500) Durable steel construction provides secure all-day depositing of valuable or private items such as cash, checks, car keys, remotes, small envelopes, and more. Designed to be mounted on a wall, Mounting hardware included for wood and concrete. Deposit slot opening is 9-1/2" wide and accomodates items up to 7/8" thick. Lock type: tubular key, Capacity: 496 cubic inches, Exterior dimensions: 15" Height x 12" Width x 4-1/4" D, Weight: 16 lbs FOR INDOOR USE ONLY: This unit is not rain/water proof and also not ideal for receiving large mail items such as books, magazines, catalogs, booklets, manila envelopes, and other larger mail.