This 225-piece Nitrile O-Ring Assortment Kit from Arctic Hayes offers 18 universal metric O-Ring sizes in a convenient, sturdy case. The O-rings are resistant to heat, most petroleum and silicone fluids, hydraulic and non-aromatic fuels, and solvents, making them ideal for a wide range of applications. They are suitable for professionals and DIY enthusiasts for maintenance tasks and plumbing repairs. The kit includes a variety of sizes, specified as follows: 10 x 3/32" x 15/64", 20 x 1/8" x 1/4", 20 x 5/32" x 9/32", 20 x 3/16" x 5/16", 15 x 7/32" x 11/32", 15 x 1/4" x 3/8", 15 x 5/16" x 7/16", 10 x 3/8" x 1/2", 10 x 5/8" x 3/4", 10 x 3/8" x 9/16", 10 x 7/16" x 5/8", 10 x 1/2" x 11/16", 10 x 9/16" x 3/4", 10 x 5/8" x 13/16", 10 x 11/16" x 7/8", 10 x 3/4" x 15/16", 10 x 3/4" x 1", and 10 x 13/16" x 1-1/16". The durable nitrile material ensures longevity and reliability in demanding environments. The case is designed with compartments for organized storage and easy access to each size.