Below is a list of Rubber Grommets manufacturers from Montclair, California. Rubber grommets are rubber rings that can be placed around an opening in a surface. Grommets are used to protect surface openings from tearing or breaking, and they protect objects that pass through the openings. For example, rubber grommets are often used to protect wires or cords that pass though openings in metal surfaces that would otherwise be too jagged or sharp.