SDL-400E Protex Drop Box w/ Electronic Lock Protex SDL-400E Wall Mounted Drop Box w/ Electronic Lock Piano hinge, Slot opening 10 inch wide will accept legal size paper and large envelopes, Saw-tooth metal baffle to protect slot Pre-drilled mounting holes in back, Mounting hardware for wood and concrete is included, Reinforced door The perfect way to lock and secure suggestions, ballots, mail, money, rent checks and more Use as a mail collection box for all out-going office mail