Protex SDB-100 Under-The-Counter Deposit Safe 1/2" solid steel hinge/dead bar to prevent removal of the door 1/8" welded steel structure Double "D" configuration (can be retrofitted with other cam locks) Safe comes with 2 (two) keys Indoor use only. The perfect way to lock and secure suggestions, ballots, mail, money, rent checks and more.^Drop Opening: 3-3/4" (W) x 7/16" (H).^Saw-toothed baffle to protect slot.^Safe comes with two keys. Tubular-style key lock with double "D" configuration.^Indoor use only!