Plastic Binding Combs

Sizing by page count is the common error, because a hundred sheets of light copy paper and a hundred of card are completely different thicknesses. Measure the stack. An undersized comb will not close and an oversized one lets pages slide sideways in the spine. Combs reopen, which is why they suit anything that gets amended. Pitch must match the machine. See binding machines, comb machines and binding supplies.