The 50 position Key Boss locking security key cabinet dropbox by Mail Boss features six adjustable key rails that can neatly and easily store up to 105 keys. The Key Boss includes 1-50 numbered key hooks that attach directly to the adjustable key rails. The innovative patented key drop bin receives deposited keys and prevents them from falling on stored keys while deterring hand fishing. 16 gauge powder coated galvanized steel and commercial grade locks make the Key Boss a true security key cabinet. Backed by the Mail Boss Limited Lifetime .