https://www.custombinding.com/paper-shredders/greenwave-cardboard-perforators/
Paper Shredders - Greenwave Cardboard Perforators - Custom Binding Products
To adjust the punching margin according to your document size. Proper margin settings ensure a secure and clean binding. Smooth coil binding, every time!
paper shredderscardboard perforatorsgreenwavecustombinding