Mmf Echelont slim steel security case echelon™ Slim Steel Security Case, Silver, Key Lock (2 Keys Included) If a simple cash box just isn`t enough, use this silver echelon™ security case. To help protect your money and other important documents during transportation, each case features a durable steel construction. Plus, with the coin containment feature, you won`t have to worry about your coins mixing during transportation. For those individuals receiving checks from tenants or employees, the check slot allows for an easy placement of checks and receipts. If you don`t want to lock the case, but you would like it to be securely fastened, simply use the latch mechanism.