1?it's best to flip the punch upside-down so you can see on the bottom how the paper is aligned with the punch parts. 1Corner Rounder Punch 3 in 1 Cuts 4mm 7mm 10mm bookmark cutter Corner RadiusesCreate perfectly finished paper crafts or scrapbooks with 3way corner cutter. 2meterial is ZBSZinc alloyStainless steel cutter blade is sharp enough for ensuring precision cutting for a neat and clean appearance. 3 Easy to Operate and Simple to Use Choose your desired material and place it into the slot. Simply push the corner of your paper inside until its properly lodged against the guides and press the handle down. The corner is now accurately and sharply rounded. 4Perfect for regular paper, EVA foam, foil, craft paper, basically thickness less than 2MM.Please use 70G230g paper jam. If your paper is too thin,please use 23 layers.do not use the Sticky paper to avoid make the punch Get stuck 5Suitable for cutting paper, christmas card punch ,photographs, scrapbooking,wrapping paper cutter, business cards or gift card. Small corner rounder punch is suit for using in office, school, home and photo studio.