Master Caster Grommet has three different size openings that make the grommet adaptable and efficient by neatly feeding wires away from desktops and work surfaces. It organizes tangled wires on office equipment, computer components, entertainment systems and more. Three different size openings. Opening Size: 3/8 to 1". Neatly feed wires away from desktops and work surfaces. Organizes tangled wires on office equipment, computer components, entertainment systems and more. Diameter (50mm): 2". One each. Grommet keeps tangled wires and cables hidden and away from desktop. Use for office equipment, computer components, entertainment systems, lighting fixtures, etc. Feed cords into one of the three adjustable openings in grommet to suit quantity and diameter of cords used. Keep wires organized and out of the way by directing wire flow. This product is manufactured by a certified WBE (women owned business). This product is manufactured by a certified SBE (small business enterprise).