The DGB-4 is a one-side cutout diaphragm grommet manufactured by Essentra. It features a black finish and a hole diameter of .390 inches and a panel thickness of .060 inches. The grommet is designed to provide a smooth flexible seal and provides strain relief and noise isolation for wires and cables routed through a panel. It also protects against abrasion and other damage from continuous flexing or vibration. The grommet's mounting flexibility ensures a secure installation even on uneven surfaces.