METALgrommets.com developed GROMMETsizer, a heavy-duty vinyl template for sizing grommets, ropes, cables and barbs. Users determine the size of grommets by the identity and flange. The GROMMETsizer is made from clear vinyl to lay over the project. It includes a chart with dimensions for grommets, centering rule in both centimeters and inches, and a common conversion chart.

SOURCE METALgrommets.com