Packing contents : 8 Pcs grommets all in one package, suitable for 3/4inch (19mm) holes. | Material : Made of pure black Silicone Rubber, durable and corrosion resistance. | Effective cable and wire management : Protect cable and wire, keep desk clean and tidy, it is also a good decoration. | Flexible openings : Can accept multiple wires from any direction. | Installation is simple and convenient : After drilling, place the main body of the grommet directly into the hole, it can hide all the cables and wires.