Mr. Gasket rubber grommets are for running wires through firewall or anywhere chaffing could occur. This heavy duty grommet set includes 30 of the most popular grommets as used in automotive sheet metal applications. The grommets feature an extra thick wall section to insulate and protect wires, cables, hoses, etcetera, from the sharp sheet metal edges. Kit includes six grommets of each size to fit the following hole diameters: 1/2 inch, 5/8 inch, 3/4 inch, 7/8 inch and 1 inch