For binding projects with up to 280 sheets of 20lb paper, you can't go wrong with any of these 1 ¼'' Twin Loop Wires. Made with the highest quality materials, a professional finish you won't get with plastic combs, a 2:1 pitch and packs of 100 wires, choose any of these products for your medium-sized and large projects to get that elegant look. Offering a permanent bind, these wires also make photocopying more practical, as the books or manuals can be placed opened flat on any surface. Do you have an automated twin loop wire binding machine? Try the premium quality Renz Wire Spool for flawless results.