If you want to make the metal spiral coils in your company, the new model is your best choice! It is easy to operate. We can provide you instructions if you have any questions. The size of the metal spiral coil ranges from 1/4'' to 1 1/4''. We can supply you with both the Nylon coated wire materials and the machine. You can order from one factory, which will save you much time to do the research and source. Welcome to visit our official website : http://www.autobindingmachine.com