Wilsonjones Heavy-duty locking d-ring view binder Heavy-Duty Locking D-Ring View Binder, 3" Capacity, Dark Blue Increased capacity and durability! When you need a professional presentation for a volume of paperwork, rely on these locking No-Gap D-Rings to stay tightly closed without gaps and hold 40% more paper than same size round rings. EasySpine™ insert makes it a breeze to insert your custom spine label without creases, rips or frustration.