Bindings are located on the left edge, so you can file documents open and open. B4 paper is opened and bound.
Outer Dimensions: Length 11.2 x Width 8.1 inches (285 x 205 mm); Back Width: 0.6 inches (15 mm); Bound Thickness: 0.02 inches (0.45 mm); Suitable Capacity: B5 only=150 sheets; B4 only = 70 sheets; Number of holes 2 holes; Hole Spacing: 80 mm; Material: Cover = mm; Material: Cover = mm; Material: 95% paper (80 used paper; Material: General copy paper 64g/m2) Number of sheets when bound. 10mm binding thickness holds approximately 100 papers.