Identify the binding method and exact hole pattern before selecting the paper. Plastic comb, spiral coil, wire, ProClick, VeloBind, and three-hole filing systems use different hole counts, shapes, and spacing. The sheet size alone does not establish compatibility. Review the machine label, die description, existing supplies, or a correctly punched sample from the same equipment. For coil and wire systems, pitch must also match because similar-looking holes can still be spaced differently. Confirm the binding edge and sheet orientation, particularly for half-letter, legal, ledger, or wide-format documents. A test sheet should fit onto the selected spine without forcing, skipped holes, or excess movement. An incorrect pattern can make a printed batch unusable even when the color, size, and paper weight are correct.