Make thinner coil-bound books quickly and affordably with the CR-B12 Ring Binding System from Carl Manufacturing. This little coil binding machine punches square holes in a 3:1 pitch with 3 holes per inch, and up to about 5 sheets at a time, depending on the paper stock. It is compatible with these 3:1 coil spines that come in several colors. The Carl CR-B12 is capable of binding up to a 12" binding edge, making it great for A4 and letter-size 11" binding edges. This is a great small coil binder for craft and hobby users who enjoy making occasional personalized books.