The Sterling Digibinder is a completely self-adjusting perfect binder. The pneumatic clamp and nipper adjust automatically. A compressor is included. Bind a thin book, then a thick book, without any adjustments whatsoever. Bind two sheets to two inches thick. The unique, heavy duty roughing blade allows for the binding of offset stock, coated stock, and stock with oil based or wax based inks. Twin glue rollers ensure an even glue application as does a third, metering roller to smooth out the glue. The machine side glues for hinge covers and even creates a light hinge due to the nipper pressure, which is adjustable. Bind perfectly square backed books or pads.