The CoilPro 101i is the most economical spiral plastic coil punch with an electric coil inserter. It punches up to 12 sheets of 20 lb. paper with the industry standard 4:1 Pitch It has sturdy construction and a metal base. The built in Electric inserter allows the user to easily spin the coil into the coil punched paper. This machine is easy to use and great for small coil binding jobs. The CoilPro 101i is a small coil binding machine perfect for desktop use and well built and reliable whenever you need to bind a book with spiral plastic coil.