Left to right, a Filofax A5 page, desk size( Day-Timer) and a classic( Franklin Covey). You can interchange the desk and Classic sizes. Page size and hole configuration are exactly the same. The A5 page is slightly wider and shorter than either the desk or classic size. The A5 holes will never line up with a 7 hole binder and vice versa. The holes must be repunched for it to work. I think the saying is, "Close but no banana." I know, cheesy humor.