Avery Heavy-Duty View Binders, 0.5" Slant Rings - 1/2" Binder Capacity - Letter - 8 1/2" x 11" Sheet Size - 135 Sheet Capacity - 45/64" Spine Width - 135 x 0.50" Ring - Fastener: Slant Ring - Pocket: 4, Internal - Polypropylene - Black - Adhesive, Ar