●【Size】 : 3-1/8" / 80mm Inside Diameter, 3-9/16" / 90mm Drill Hole, 3-15/16" / 100mm Outside Diameter, 1/8" / 3mm Groove Width, 33/64" / 13mm Total Thickness ●【Material】 : Flexible Synthetic Rubber,Non-toxic and Tasteless,Strong Insulation Protection Function,Dust-proof and Flame-retardant ●【Features】 : Keep wires or any other materials from rubbing against metal,Run wires through frame, firewall, sheet metal and other applications. ●【Installation】: Easily cut the diameter of the rubber plug,then snap directly into the drill hole. ●【Package Includes】 : 4 Pcs x Rubber Grommet