Material: Made of sturdy black ABS plastic, more durable for wire management. Desk hole grommet: Set of 6 packs, a quality-price combination. Mounting hole diameter: 50mm / 1.97 inch; diameter 59mm/2.32inch, height 16mm/0.63inch, thickness 2mm/0.079inch. Removable lip: has a small open hole to pass the wires through and keep them more neatly; The cover is removable, so if you have a lot of cords, you can use the desktop grommet without a cover. Desktop Wire Organizer Grommet: Allows you to run cords neatly at the top of desks, making them look organized and keeping them cleaner on desktops and work areas. Application: Desk cord grommet can neatly organize cables from computer desks, PC peripherals, office equipment, home, office and school entertainment systems.