【GET YOUR MONEY'S WORTH 】Our spiral coil binding machine comes with 1 Box of 5/16''（binding about 50 sheets) coil spines kit and coil crimper tool, no need to buy separately, save your money. It's an excellent addition to any school, homeschool, or small office environment, you can securely bind 4:1 coil documents with ease 【SUITABLE FOR MULTIPLE PAPER SIZES】46 fully adjustable disengaging pins let you control where the binding machine punches holes, Open-throat design allows you to punch sheets larger than standard 8.5" x 11", great for legal, tabloid, A4 A5 sizes and more. Apply steady pressure to punch holes in up to 20 sheets of 80 g(paper thickness≈20 lb) paper at a time 【ELECTRIC COIL INSERTER & LABOR-SAVING】 Electric Coil Inserter helps to create professional-looking bound books in the office or at homeschool quickly and easily. The spiral coil binding machine electronically inserts plastic coils for faster binding, saving time and effort for large workloads 【ADJUSTABLE MARGIN】With adjustable side and edge guide, this machine also ensures a precise alignment with each document your bind, and you can easily customize the paper margin: 2.5mm, 4.5mm, 6.5mm to create professional-looking works 【RISK-FREE PURCHASE】Every batch of our binding machine had been tested before packing. Our friendly and reliable customer service team will respond within 24 hours! You can purchase our products with full confidence Spiral Coil Binding Machine