1. WIDE RANGE OF APPLICATIONS: The 10-hole loose-leaf punch is suitable for binding A4, B5, A5, A7, B4 paper, 20, 26, 30 holes or more porous numbers of loose-leaf, ledger, etc. 2. 10 SHEET CAPACITY: The paper binding machine can penetrate up to 10 sheets (70g) of paper with a diameter of 5.5mm and a hole spacing of 9.5mm. 3. CUSTOMIZED PUNCHING: The scale line bracket on the ruler board can accurately locate the edge position of A4, A5, B5 paper. A4 30 holes, A5 20 holes and B5 26 holes can be drilled as needed. Once you have mastered the method of use, you can customize the number of holes, DIY punching. 4. PRECISE HOLE PUNCHING: Both sides of the punch have positioning pins and rulers, which can easily determine the position of the punch. 5. DURABLE AND NON-SLIP: The paper spiral binding machine has an all-metal painted body for robust durability. The clamshell plastic tray collects paper scraps, is non-slip and protects the tabletop.