Rhin-O-Tuff 7700 Heavy-Duty Electric Open-Ended Punch:Rhin-O-Tuff 7700 is a top of line heavy-duty electric punching machine capable of operating via foot pedal, palm switch or versa-punch. 7700 is a very popular choice for offices with need for frequent punching because it includes a patented anti-jam feature that automatically reverses machine to prevent jamming. Included with your purchase of 7700 comes your choice of one of 20 interchangeable dies. This punching machine includes several useful features that make it one of most popular in its category. Some of these features include tool-free die changing, open-ended punching, a margin depth selector, a binding diameter guide and a convenient waste compartment. With 7700, you can punch up to 55 sheets of paper at once and complete approximately 90 cycles per minute. This machine offers quiet, simple operation that its competitors simply can't match. At a hefty 90 lbs, all-metal HD7700 is a bargain - buy yours today!