Features Durable Material: Embedded with high quality nitrile rubber for better sealing effect. Can be used in extreme conditions, with a maximum pressure of 40 MPa and a maximum operating range of -25 degrees Celsius to 100 degrees Celsius. Easy to Storage: Comes with a convenient plastic storage box with large and small compartments. Each size comes with a label for easy picking and storage. It can be used for months or even years. You don't have to go to the hardware store. Package Includes: This O-Ring Kit contains 240 O-Rings in 12 sizes. Various sizes and quantities will meet your needs. Pressure systems for pipe connections, plugs, and mechanical devices. Prevent leakage of water, oil, fuel, etc. Widely Used: for faucets, pipes, pressure washers, hose nozzles, sinks, filters, hydraulic oil, automotive engines, mechanical bearings, pumps, boats, oil, gas control valves, sprays, air, kitchen bathroom water accessories O-ring kit seal leak repair. Easy Storage: Various O-ring rubbers are housed in a sturdy plastic storage case, each size comes with detailed label sheets, and are stored in small to large order for easy retrieval. Feature: 1.High quality NBR embedded, better sealing effectiveness. 2.It can be used in extreme conditions, maximum pressure 40 MPa, maximum working range of minus 25 degrees Celsius, to 100 degrees Celsius. 3.Suitable for pipe connections, screw plugs, and pressure system of mechanical devices. 4.Prevent water, oil, fuel, etc from leaking. 5.12 different specifications to meet your needs of different sizes. Specification: Material: Metal and NBR Weight: 745g / 26.28oz Working pressure: -25 - +100℃ Working temperature: 40MPa / 5800psi (Max) Working medium: Oil Inside diameter: 6\8\10\12\14\16\18\20\22\24\27\30mm / 0.24\0.31\0.39\0.47\0.55\0.63\0.71\0.79\0.87\0.94\1.06\1.18in Package list: 240 * Ring(1 box, 12*20) Note: The actual product color may deviate from the photo due to light. Package List