What is this?Wire Grommet, for protecting wires, cables, cords and pipes away from rough surfaces. Widely used in house, office, industry, boat, etc..What will I get?The black conical shape grommets, is in size of: Drill Hole Diameter: 30 mm / 1.18-inch; Groove Thickness:3mm; Inner Diameter: 27 mm / 1.06-inch; Overall Size: 37 x 36mm / 1.46 x 1.42-inch(Dia*T)In the package of: 6 x rubber grommetsIs there any advantages of the product?It is made of thicker rubber, soft, durable and heat resistant. With multiple o shaped body, easy to change the depth of the grommet to fit your project.How to use it?Drill a hole on your plate first, then open holes for your wire on the grommet, lastly, mounting to finish.What should I notice?The rubber material may smell not good. Please choose the proper size for your project before purchasing.