Quality self-piercing grommets need to be supported by quality tooling and attaching machinery. This hand-operated bench machine cuts the hole and sets the grommet simultaneously. It's easy to use, the extra long handle gives you the leverage you need to punch through the thickest banner material. And the adjustable stop screw gives you just the right amount of pressure to close the grommet assembly. It will also work on Polyethelene, Reinforced Vinyl, Coroplast, Tyvek, Celtic posterboard, Styrene, and many other materials.