The Dupli-Key system utilizes two different sets of numbered key tags. Attach your master keys to the red octagonal-shaped self-locking key tag and fasten duplicate loaner keys to white oval-shaped, snap-hook key rings. When a loaner key is issued, insert a receipt slip in the brass holder and place on hook. Keep track of all vital key information in the Cross Reference Index Kit (included). Key Capacity: 240; Material(s): Welded Steel; Color(s): Sand; Width: 16 1/2″.