Grommets are tools that are quite often noticed on things like bags, curtains, apparel, and athletic gear and so on. Although they are typically round in shape, they are also available in countless other sizes. Nonetheless, when an individual refers to grommets, it often means a hard ring usually made up of a material like plastic or metal. The main purpose of these tools is to strengthen the area that is cut around a hole in a given plastic material or fabric.