Material - Made of rubber, these wall grommets feel very nice, good elasticity, wear and corrosion resistance, cushioning and shock absorption, electrical insulation, long service life. Design - The cross-shaped hole of the grommet allows the wires to pass directly through the drilled hole, protecting the wires from friction and damage from metal edges, and providing insulation protection to ensure safe passage through frames and firewalls. Installation - The grommet is easy to use, eliminating the need for screws or nuts to secure it, just need to insert the desk grommets into pre-drilled holes. Using the included nylon cable ties can reduce cable clutter and keep cables organized and clean. Wide Application - Cable cord grommets are widely used in cable management of firewalls, electrical appliances, household equipment, etc., suitable for various scenes such as home and office places. Material: Rubber, Nylon Color: Black, Blue Fit Hole Diameter: 16mm/ 5/8 inch Inner Diameter: 10mm/ 3/8 inch Outer Diameter: 20mm/ 13/16 inch Thickness: 12mm/0.47 inch Cable Tie Size: 2.5 x 100mm/0.1 x 3.94 inch(L*W) Cable Tie Label Size: 20 x 13mm/0.79 x 0.51(L*W) Package: 4Pcs x Grommets, 12Pcs x Cable Ties