Quantity: 225pcs / 18 different sizes of rubber o-rings Packaging: Supplied in a convenient, resealable, refillable plastic storage case Advantages: Rubber construction resistant to oil, gas, and other solvents water and alcohol Application: Use for personal and professional workshops, garages and plumbing services Uses: Ideal for preventing leaks when working with plumbing, hydraulic, air and gas fittings Specifications: Item: Rubber O-rings 225 pieces Color: black Material: Rubber Size: Quantity (Pcs) = Internal Diameter (mm) x Thickness (mm) 20 = 3x1 20 = 4x1 20 = 4.5x2 20 = 5x2 20 = 6x2 20 = 6x2.5 20 = 6x3 20 = 7x2 20 = 8x2 5 = 9x2< br/> 5 = 10x2 5 = 12x3 5 = 13x3 5 = 14x2.5 5 = 17x2.5 5 = 18x4 5 = 20x2 5 = 22x2 Features: 1. 18 different sizes, 225 pieces. 2. The sealing ring is made of high-quality rubber. Variety of thickness and size are all in one box, very convenient to use. 3. Resistant to heat, mineral oil, wear. Suitable for workshops and plumbing services, cars, marine and RV wiring work, Flexible leaking taps and protects wiring in firewalls and junctions, Furniture to protect computer wires and electronic equipment in offices or at home, etc. 4. Rubber construction resists oil, gas, water and alcohol-based solvents. Package includes: Rubber O-rings 1 x 225pcs