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 Grommets: 50pcs x 7mm, 40pcs x 9mm, 30pcs x 12mm, 20pcs x 15mm, 10pcs x 19mm, 10pcs x 22mm, 10pcs x 25mm. Application: Electrical 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 to protect cables or wires from sharp corners or edges, grip the wire securely and effectively to protect against fire hazards. Automotive rubber grommets are also important parts in automotive applications, they can also effectively reduce vibrations and are used to seal various important applications under the hood and body. The 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 of Most Commonly Used Rubber Grommets Widely Used Rubber Grommet Kit Set Black Firewall Hole Plugs 7 Sizes Electrical Wire Gasket Assortment for Car, Boat, Pump, Plumbing, Cable Wiring and Home Improvement Cord Wire Hose Organization. The rubber grommet assortment kit is useful in many professions such as plumbers, mechanics, electricians, DIY, etc., used to assemble parts for devices such as automotive, boat, valve, RV, pump, landscaping wiring, furniture, dashboard/rear view, audio. speakers and wiring of the various mechanisms, etc. Quantity delivered: 1 box (170pcs)