2.5" (62.5mm) Metal Desk Grommet | Brushed Nickel - (3 Pack) 2.5" = Hole diameter of 2.5, lid diameter 3", opening of .82" 1.5" smaller opening = Hole diameter of 1.5, lid diameter 1.825", opening of 0.5" 1.5" larger opening = Hole diameter of 1.5, lid diameter 1.825", opening of 0.81"