When precision counts, count on the CombBindÂ® C450E's exclusive "Paper Centering System" combined with vertical feed to align paper for perfect punching. Plus, the exclusive "Paper Separator" divides sheets into the right thickness for punching. One-touch electric punching is easy and efficient. For 11" documents. Rotary dial for control of comb opening and closing. Electric punch operation. Easy to use full size punch handle also serves as a carrying handle.