Feature: 1. Multifunctional: This book binding machine can be used to bind A4 and A5 sized paper, and you can easily customize the paper margins to 2.5mm, 4.5mm, 6.5mm to create professional looking pieces. 2. Humanized Handle: This sheets book maker features a humanized handle that applies only steady pressure, punches holes in up to 20 sheets of 80 gsm ( 20 lb. paper thickness ) paper at a time, and binds up to 120 sheets (80 gsm 20 lb.). 3. 3:1 Pitch: This wire binder machine can be bound with any 3:1 pitch attachment such as 3:1 pitch coil binding spine, 3:1 pitch click binding spine, or 3:1 pitch wire binding rings, which is perfect for multiple scenarios. 4. Easy To Use: This comb binding machine is simple to use and requires very little force throughout the process. You just line up your pages, press the punch lever, and insert the comb. 5. Wide Application: This comb binder machine has a wide range of applications and can be used at home, office, school, print store and printing house etc. Specification: Item Type: Binding Machine Material: Alloy Steel Punching Capacity: Approx. 20 sheets 80g Maximum Binding Capacity: 120 Sheets 80g Paper Applicable Paper Size: Approx. Width ≤300mm / 11.81in Puncher Capacity: 34 Hole blades Margins: Approx. 2.5mm / 0.1in, 4.5mm / 0.18in, 6.5mm / 0.26in Hole Spacing: Approx. 8.47mm / 0.33in. Package List: 1 x Binding Machine 1 x Manual 1 x Testing Paper Note: Please press the punching handle all the way to the bottom and do not stop in the middle of punching or the paper will jam. If the machine jams, stop immediately to avoid further damage and disassemble the machine according to the user manual to clear debris.