What is this?These are the grommets used to cover panel holes. Rubber grommets grip wires and cables passing through holes, keeping them secure while protecting them from cuts and snags. The rubber grommets are mainly used to protect cables or wires from being scratched by electrical boxes and some wooden boxes. They are widely applied for hole plugging, outlet sealing, and other industrial equipment.What will I get?Size: 28 x 10mm/1.1 x 0.4-inch (OD x ID)Height: 14mm/0.55-inchMounting Hole Dia.: 20mm/0.79-inchMaterial: Silicone RubberColor: BlackIn the package of: 6 x Rubber GrommetAre there any advantages of the product?Made of silicone rubber material, the grommet is flexible and durable, with high temperature and corrosion resistance.It is waterproof, dustproof and has strong insulation, which is safer to use.