Material: made of rubber, with uniform wall thickness, strong tensile strength and good toughness. Color: black grommet plugs. The protective coil also protects the wires and also acts as an insulating gasket. 170pcs 7 sizes plugging 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 hose, spray, water hose, decoration. Come with a storage case, easy to carry and resealable. Function Rubber grommets are commonly used to protect or cover holes and to protect cables or wires from sharp corners or edges, grip the wire securely and effectively to protect against fire risks. Automotive rubber grommets are also important parts in automotive applications, they can also effectively reduce vibration and are used to seal different important under hood and body applications. Grommets are heat-resistant, oil-resistant, wear-resistant and very convenient and practical to use. There is a thin rubber membrane in the middle so you can puncture it to make your own opening. 7 different sizes most commonly used rubber grommets Widely used Rubber Grommet Kit Black Firewall Hole Plug Set 7 Sizes Electrical Wire Gasket Assortment for Car, Boat, Pump, Plumbing, Cable Wiring and Cord Wire Pipe Organization Home Improvement . Rubber Grommets Assortment Kit is useful in many professions such as plumbers, mechanics, electricians, DIY, etc., used to assemble parts for appliances such as automotive, boat, valve, RV, pump, landscaping wiring, furniture, dash/rear view, audio. loudspeakers and cabling of the various mechanisms, etc. Quantity delivered: 1 box (170pcs)