This small plastic desk grommet is great for keeping your desk free of annoying wires. This grommet has a 6 cm diameter and a lip that overlaps another 1/2 cm in radius. The wire hole measures app. 2 cm x 4 cm and slides open or shut. Fits whole size 60mm, overall size is 2-13/16" inside top ring diameter is 2-1/8". Height under lip on the bottom is 13/16".