Made of Alloy with a coating with chrome and mirror finish, never scraches and scuff your cable. Easy to open by turning the top cover. Keeping your computer cables tidy and neat. Product Name : Desk Grommets; Fit for : Computer Desk Material : Zinc Alloy, Rubber; Color : Silver Tone, Black Mounting Hole Size : 53mm / 2.1 inch; Overall Size : 60 x 14.5mm / 2.3 inch x 0.6 Inch (D*H) Open Hole Size : 20 x 20mm/ 0.79 Inch x 0.79 Inch (L*W); Outer diameter: 50mm Net Weight : 45g Package Content : 2 x Desk Grommets Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.