225 Piece Metric Nitrile O-Ring AssortmentProduct Details:Contains 225 assorted metric nitrile O-rings in 18 of the most popular sizes in one organized PVC caseNitrile rings resist heat, most petroleum, silicone fluids, hydraulic and non-aromatic fuels and solventsSpecially designed to create a tight seal when used in plumbing, hydraulics, air and other industrial applicationsResistant to changes in temperature, air, water, natural gas, silicones, solvents and petrolIncludes handy carrying case for quick and convenient storagePerelHAS02