Designed for small- to medium-volume usage, the TB-C12 is an affordable 19-ring comb binding machine that features a built-in manual comb opener. The TB-C12 comb binder punches up to 12 letter-sized sheets per pull and is capable of binding documents up to 1-3/4" thick (using a 2” plastic binding comb). with an adjustable side guide and three-position depth margin, this TB-C12 provides consistent, professional results on documents up to 11" long. The TruBind TB-C12 coil binder is compatible with all standard 19-ring binding combs and features a one-year warranty.