Bindings are located on the left edge, so you can file documents open and open. A3 paper is opened and closed.
Outer dimensions: 12.0 x 9.1 inches (307 x 230 mm); Back width: 0.6 inches (15 mm); Bound thickness: 0.02 inches (0.45 mm); Suitable capacity: A4 only; A3 only = 70 sheets; Hole spacing: 3.1 inches (80 mm); Material: Cover = 95% used paper 64g/m2) Number of sheets when bound. 10mm binding thickness holds approximately 100 papers.