Vaultz Locking Jumbo Contractor Binder Case, 15.25 x 4.5 x 14.5 Inches, Silver Treadplate (VZ00710) Contains a standard size three-ring binder mechanism, so can hold any three-hole punched page or sleeve Double combination locks keep your contents safe Aluminum and steel reinforcements offer protection Vaultz CD pages can be purchased separately to fill in favorite CDs Collapsible ring mechanism allows for a wide variety of uses