The C20 manual binding machine uses classic CombBind spines to firmly secure bound documents. Punches up to 20 and binds up to 330 sheets, with a 1 1/2 spine. Compatible with standard letter, oversize or A4 sheets. A color coded document and spine size guide are included. Manual. Binding Spine Type: Comb Binding Sheet Capacity: 330 Punching Sheet Capacity: 20 Colors: Black.