Feature: 1. APPLICATION RANGE: This 21 hole binding machine is suitable for letter size, A4, A5 or smaller sizes. With adjustable edges guide, ensuring precise alignment of files, making it easy to create margins of 2.5mm, 4.5mm, and 6.5mm. 2. BINDING CAPACITY: With 250 sheets 80g binding capacity and 18 sheets 80g punching, holes can be punched on paper with stable pressure. Equipped with a user friendly handle for comfortable grip and easy operation. 3. PUNCHING SPECIFICATION: This comb binding machine features 21 holes design, and has a punching size of 2x8mm. The incisive blades ensure clean punching, suitable for homes, schools, offices, shopping malls, etc. 4. DURABLE AND LIGHTWEIGHT: This book binding machine is compact and lightweight, just grab the handle in the middle of the bottom plate to move. With convenient use and carry, it is perfect for school or small office environment. 5. SIMPLE OPERATION: This book binder allows you to punch and bind on the same machine. Arrange the page in a row, press the punching bar, and then insert a comb, which is convenient and labor saving. Specification: Item Type: Comb Binding Machine Punching Capacity: 18 Sheets 80g Binding Capacity: 250 Sheets 80g Margin: Approx. 2.5mm / 0.1in, 4.5mm / 0.18in, 6.5mm / 0.26in Punching Size: Approx. 2 x 8mm / 0.08 x 0.31in. Package List: 1 x Binding Machine 1 x Handle 1 x User Manual 1 x Testing Paper Note: 1. When installing the binder handle, make sure to install it 90 degrees vertically.2. Please press the punch handle all the way to the end. Do not pause during the punch, otherwise the paper will get stuck. If the machine is stuck, stop immediately to avoid further damage and disassemble the machine according to the user manual to clean up debris.