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 5mm, 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. 1 x Binding Machine1 x Handle1 x User Manual1 x Testing Paper Item Type: Comb Binding MachinePunching Capacity: 18 Sheets 80gBinding Capacity: 250 Sheets 80gMargin: Approx. 2.5mm / 0.1in, 4.5mm / 0.18in, 6.5mm / 0.26inPunching Size: Approx. 2 x 8mm / 0.08 x 0.31in