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".