Wire binding is known by a number of different names including twin loop wire, wire-o, double loop wire, double-o, ring wire and wirebind. This binding method requires the user to insert their punched pages onto a "C" shaped spine and then use a wire closer to squeeze the spine until it is round. Documents that are bound with wire binding will open completely flat on a desk and allow for 360 degree rotation of bound pages. Select the proper size wire by clicking the arrow on the right edge of the Quantity and Size description. Use the mouse to select the one you want by clicking on the description. Then just press BUY to add it to the cart.