Comb sizes and capacities

The width of the spine determines the capacity of the binding comb: The wider the width, the more pages can be bound by the binding comb.

So, for instance, a binding comb with a spine 28mm can bind up to 240 punched sheets of A4 paper. For presentation purposes it is better to choose a binding comb with a capacity near to the amount of sheets you intend to bind. Even a hundred sheets of paper would flap about hopelessly if bound by a 51mm binding comb.