This easy to use all metal, manual comb binding machine offers a user friendly way to bring that professional finish to your documents. It has punch cancellation so it can be used for 20 and 21 ring combs. Manually punches up to 15 sheets at a time. Dual handles offer time savings through the ability to punch and bind simultaneously. Maximum binding thickness 50mm and maximum binding width 300mm. Easy to operate machine for binding A4 documents.