#3 Grommet (7/16") Hole Cutter
The #3 (7/16'' or 11.11 mm Inner Diameter) Grommet Hole Cutter is manufactured from drop forged steel. To use, the cutter is placed where the grommet is to be installed. Make sure that there is a wood or silicone block underneath the spot so that you don't damage the cutter. Once placed, use a dead blow hammer to hit the cutter until it cuts through the material. After, install a grommet using the die setting tool.