Matters Needing Attention: Please use 80-220gsm paper. Put some layers to punch If your paper is too thin, but thickness less than 2MM. Sticky paper may get stuck in the Rounder.Sticky paper to avoid make the punch Get stuck. Widely Application: corner punch is suitable for cutting paper, photographs, scrapbooking, business cards and gift cards. Durable and Sturdy: corner rounder is well processed with sturdy plastic housing, which is smooth and longtime use Easy to Use: Place your material into the slot and push it's corner inside to the end. Then corner is rounded when you press the handle down. 3 in 1 Corner Rounder: corner cutter is designed to punch three different corners, a perfect tool for paper crafts and scrapbooks.