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: 35 mm / 1.38-inch; Groove Thickness:3.5mm; Inner Diameter: 32 mm / 1.26-inch; Overall Size: 43 x 41mm / 1.69 x 1.61-inch(Dia*T)In the package of: 4 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.