What Is YO Coil

What is YO coil

YO coil usually refers to a double  coil, also known as an O-coil(from English "wire-o-binding").  Double coil is pre-set size and specifications of the two steel coil, common material is divided into plastic spray coil and plastic coil two kinds. 

Usually on the left or above the printed matter to make a round hole or square hole, YO double ring through the use of YO ring binding machine after pressing fixed the whole binding process is completed.