Product Description Quantity:170 Materials: nitrile rubber Color: Black Application: Apply to automotive, valve, pump, electrical appliance, chemical pipe, spray, water pipe, and decoration. Size: 50 pcs 7.14 mm40 pcs 9.53 mm30 pcs 12.07 mm20 pcs 15.88 mm10 pcs 19.05 mm10 pcs 22.23 mm10 pcs 25.40 mm Package content: 1 box of rubber protective coil set 1. Multi sizes and quantities: The case contains 170 pieces of 7 different sizes of rubber grommet, these o rings' specified sizes have a wide range of applications. 2. High-quality materials: The gasket is made of nitrile rubber(NBR), grommets are more resistant to oil, heat-resistant and UV-resistant, phosphoric, hydrochloric, sulfuric, and Saltpeter acid, non-flammable and are of good electrical resistance capability. 3. Characteristics of various: The 170 pieces of rubber ring come with a box, store in different sizes separately, are easy to carry, store, and pick up, It's not scattered all over the place. 4. Usage: Rubber grommets apply to automotive, valves, pumps, electrical appliances, chemical pipes, sprays, water pipes, and decoration, and protect cables or wires from sharp corners or edges. 5. A variety of sizes: The box contains seven common sizes:50 pcs 7.14 mm40 pcs 9.53 mm30 pcs 12.07 mm20 pcs 15.88 mm10 pcs 19.05 mm10 pcs 22.23 mm10 pcs 25.40 mm, seal rings will fit those drill holes precisely and efficiently, fit for your various needs.