Multiple Sizes:o-ring assortment kit contains standard 20 metric rubber o-rings, o-rings with inner diameters from 1 to 25mm and thicknesses of 1mm, 2mm, 2.4mm, 2.5mm, 3mm, which can meet almost all of your needs High quality material: O-ring bushings are made of commercial grade NBR material with a working temperature range of -40℉/-40℃ to 248℉/120℃. With excellent resistance to high and low temperatures, it is very suitable for thermal machinery, automotive, and faucet pipe sealing repair Wide applications: O-ring classification is very suitable for faucets, high-pressure washers, motorcycles, boats, car engines, pumps, solenoid valves, meters, sensors, mechanical bearings, pressure pipes and other accessories for sealing DIY repairs Easy to use and store: Various o-ring kits, 20 sizes of o-rings are placed in order in a sturdy plastic storage box, each size comes with a detailed label paper, very easy to use, o-rings are stored in order of size, easy to retrieve and store