Commercial grade rubber material gives excellent resistance to heat, mineral oils and wear Assortment of 225 piece o-rings set in a strong plastic case Ideal for the garage, the workshop, bearing, pump, electrical appliance, car, door, window, mechanic, plumber, etc. The case gives neat storage and safe transportation, saving your time and effort. efforts 18 different sizes will satisfy almost all your needs 18 sizes 225 pieces 20pcs 3x1/20pcs 4x1/20pcs 4.5x2/20pcs 5x2/20pcs 6x2/20pcs 6x2.5; 20pcs 6x3/20pcs 7x2/20pcs 8x2/5pcs 9x2/5pcs 10x2/5pcs 12x3; 5pcs 13x3/5pcs 14x2.5/5pcs 17x2.5/5pcs 18x4/5pcs 20x2/5pcs 22x2. Handy Tool They are used to prevent lines, wires and cables from scratching or scraping rough surfaces . They can also effectively reduce vibration and are used to seal other important under-hood and on-body applications. Assorted Model 225 Pieces 18 Popular Sizes The sealing washer set for O-rings meet almost all your needs, with marked sizes paper, making it easier for you to distinguish the size you need. The ultimate flexibility Soft and flexible O-ring, easy to attach, easy to install, very suitable for sealing gasoline, diesel, lubricating oil, water, air, gas and various chemical substances.