null Material:Zinc AlloyDiameter :18mm/25mm/35mm/40mm/45mm/50mm/60mmColor: Black / SilverZinc Alloy material, more durableAllows wires and cable to pass through safely and neatly.Keeping the complete pc or appliance cables tidy to present a neat.Used widely in office, home, hotel, bank, etc.Also suitable for vents, wine cabinets, shoe cabinets, wardrobes, etc.Package includes:1pcs X twine hole coverNote:1. Please allowed 1-5mm differences due to handbook measurement, thanks in your understanding!2. Due to the difference between varied monitors, please needless to say the image might not mirror the actual color of the item.