Martin Yale CB 1000 Electrical Coil Binding Machine:This machine is ideal for use in professional office or copy room. motor only runs when activated, making it very energy efficient and quiet. CB 1000 punches 4 holes per inch in up to 25 sheets of paper with just push of a button. vertical feed throat opening reduces likelihood of punching mistakes and auto-reverse clears most punching jams. Some of its many features are a large chip drawer with a see-through window and convenience tray with document sizing, a unique coil-sizer, and tool organization. built-in book-former helps align thicker books for simpler coil insertion.