Reclosable bags with metal grommet are brass grommets sometimes called an eyelet fused to the in the body of the zipper bag for added reinforcement. Available in 1/4" and 3/8". A brass grommet seals both layers of plastic together, so it is more effective to add it to the bottom of the bag. Used when a bag must endure substantial abuse or holding heavier items. Used many times to attach the bag and contents with a twist tie to an object. It can be used as a hang hole as well.