Electric system binds up to 330 sheets. Electric push-button punch handles up to 20 sheets, and the Guide Right™ feature aligns paper along both the front and side for better accuracy. Accepts letter size documents as well as both standard and oversized covers. Maximum comb size: 1 1/2". Binding Spine Type: Comb; Binding Sheet Capacity: 330; Punching Sheet Capacity: 20; Maximum Binding Edge: 11".