Material: made of rubber, with uniform wall thickness, strong tensile strength and good toughness. Color: black grommet caps. The protective coil also protects the wires and also acts as an insulating seal. 170pcs 7 sizes blanking eyelets: 50pcs x 7mm, 40pcs x 9mm, 30pcs x 12mm, 20pcs x 15mm, 10pcs x 19mm, 10pcs x 22mm, 10pcs x 25mm. Application: electric gromit used for cylinder, valve, pump, electrical appliance, chemical pipe, spray, water pipe, decoration. Come with a storage case, easy to carry and resealable. Function Rubber grommets are commonly used to protect or cover holes and protect cables or wires from sharp corners or edges, grip the wire safely and effectively to protect against fire hazards. Automotive rubber grommets are also important parts in automotive applications, they can also effectively reduce vibration and are used to seal different important applications under the hood and body. The cable grommets are heat resistant, oil resistant, wear resistant and very practical and convenient to use. There is a thin rubber membrane in the middle so you can pierce it to make your own opening. 7 Different Sizes Most Commonly Used Rubber Grommets Widely Used Rubber Grommets Kit Black Firewall Hole Plugs Set 7 Sizes Electrical Wire Seal Assortment for Car, Boat, Pump, Plumbing, Cable Wiring and home improvement cord wire pipe organization. Rubber Grommet Assortment Kit is useful in many professions such as plumbers, mechanics, electricians, DIY, etc., used to assemble parts for devices such as automobile, boat, the valve, the camper, the pump, landscaping wiring, furniture, dashboard/rear view, audio. speakers and wiring of the different mechanisms, etc. Quantity delivered: 1 box (170pcs)