The Tamerica TW-2100 Manual Wire Punch and Bind Machine saves time and money. The Tamerica TW-3100 3:1 wire binding machine is a full-function binding system that is both versatile and durable, making it an ideal choice for small office use. The is a heavy-duty, all-metal binding machine, with a powerful manual punching mechanism that is capable of punching up to 20 sheets at a time (based on 20 lb. paper). It has a 14" maximum punching length with 40 fully-disengageable dies to allow it to punch a wide array of document sizes and specialty paper types, such as three-hole punched paper. The TW-3100 has a built-in wire closer that can bind books from 3/16" to 9/16" in thickness. It features a user-friendly, two-handle design that increases binding efficiency. This model is also equipped with a four-position adjustable depth margin and a wire holder to aid in inserting your document. The TW-3100 is compatible with all 3:1 wire binding supplies, including 32-loop GBC WireBinds.