Professional electrical comb binding machine with a 2 year guarantee for binding a4 a5 letter and us documents comb bound documents lay flat and wrap around for easy reading and pages can be added or removed quickly and easily allows you to bind up to 51mm comb size which is 500 sheets of paper the electrical punch function can punch up to 28 pages at one time includes a manual adjustable guide line and useful spine size selector to ensure you use the correct sized combs the leitz com bind 500