Create stylish and classic document booklets with a detailed finish with these Hard Cover binding channels! These covers, capable of binding up to 300 sheets of 20lb paper, are great for heavy duty binding. Stop wasting documents by punching and gluing-these stress-free metal binding channels allow for damage-free binding. You can even edit easily with metal binding. MasterBind makes high quality products, so these covers will ensure security and appealing professionalism. Documents made with metal binding make great for manuals, notebooks, photo books, portfolios, catalogues, or any other document that needs to be securely bound.