Middle Atlantic grommets are a great way to have cable protection around knockouts, whether you need it for a specific size, stand-alone or for ganged applications. We offer Middle Atlantic 30 foot rolls of flexible black grommet material good for any size knockout. If you need a stand alone or ganging grommet, our Middle Atlantic ganging grommet rings are an inexpensive way to protect your cables from chaffing in any trade size 4" electrical knockout.