1.Paper puncher is with independently cast metal blade for edge, which is durable. 2.Ruler comes with graduation marks to accurately position the edge of A4, A5, B5 paper. 3.There are movable positioning columns on both sides of the fuselage to assist in positioning the future drilling hole distance. 4.Suitable for binding A4 (30 holes), B5 (26 holes), A5 (20 holes) binding loose-leaf handbooks, etc. Also this paper puncher is fit for DIY binding for up to 5 sheets of 70g paper each time. 5.A scrap box is attached at the bottom, which is convenient for storing punched scraps. Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-YJL official store