Also know as plastic coil, color coil, and spiral coil this binding method typically places 4 holes per inch or 4:1 pitch (6mm) along the edge of the document through which the plastic coil is fed allowing the document to lay flat. Select the proper size spiral coil 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.