Snap Together Grommets are washable, polypropylene grommets that are perfect for light duty utility tasks like weather cloths, tarps, sun awnings, and shower curtains. These grommets are also UV resistant and will not rust or corrode. Install a Snap Together Grommet in up to 4 layers of Sunbrella (or 0.05 inch webbing) with a #5 hole cutter and hammer. Place a piece of wood on top of the grommet and tap to set through thicker fabrics.