Quantity: 170PCS Materials: nitrile rubber Color: black Application: Apply to automotive,valve,pump,electrical appliance,chemical pipe,spray,water pipe,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 gromment,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 rubber ring comes with a box, store in different sizes separately,easy to carry,store and pick up,It's not scattered all over the place. 4. Usage:Rubber gromments apply to automotive,valve,pump,electrical appliance,chemical pipe,spray,water pipe,decoration,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.