Wide Application Rubber O-Ring Kits for Pressure Washer, Automotive, Plumbing Hose Nozzles, Sinks, Hydraulic Filters, Bearing Machining Motors, Pumps, Boats, Oils, Gas Control Valve, Kitchen and Bathroom Water Fitting MULTIPLE SIZES: the kit contains the 24 most commonly used sizes: 6mm/0.8cm/7mm/8mm/9mm/10mm/11mm/12mm/13mm/14mm/15mm/15mm/1/12mm/13mm/14mm/15mm/1/12mm/13mm/14mm/15mm/12mm/13mm/14mm/15mm/1/12mm/13mm/14mm/15mm/1/16" 30" 17mm/18mm/19mm/20mm/21mm/22mm/23mm/24mm/25mm/26mm/27mm/28mm x Thickness: 0.2cm 0.3cm/0.3cm Material: small black o-rings made of commercial grade nitrile (NBR, Buna-N), it has excellent oil resistance, high temperature and low temperature resistance, the operating temperature range is -40°F to 248°F, maintains good elasticity, has the advantages of ozone and weather resistance CONVENIENT STORAGE: Assorted rubber O-rings for gaskets are placed in a sturdy plastic storage box, each size with detailed label paper, are stored in order from small to large for easy retrieval. It can be used for months or even years rather than buying them from a hardware store {Satisfaction Guaranteed] TWCC brand always guarantees high quality products and good after-sales service. If you are not satisfied, we will return your kit for free for no reason