Features: These O-Rings wash seal are selected from silicone, which is resistant to heat, oil, gas, water and most silicone liquids and solvents. They are durability and have long service life. Different Size to meet your different needs, specially achieve a tight seal when used in plumbing, faucet and other industrial applications. Soft and flexible O-Rings, easy to install, great for lubricating oil, water, air, gas and various chemicals. These silicone washers come in a clear, divided organizers box, which is very convenient for storage and selection. You can save trouble of tidying up and choosing the Size. Wide use for garages, plumbers, workshops, window, electrical appliances, pumps, drain plugs. And can prevent metal-to-metal contact to protect cables, cables passing through firewalls. Specifications: Component:Nylon Outside diameter: 16/12/10/9/8/5/5mm Inner diameter: 8/6/5/4/3/2.5/2mm Package Includes: 40Pcs 6x1.9mm O-rings 40Pcs 7x1.9mm O-rings 40Pcs 8x1.9mm O-rings 40Pcs 9x1.9mm O-rings 40Pcs 10x1.9mm O-rings 20Pcs 10x2.4mm O-rings 20Pcs 12x2.4mm O-rings 20Pcs 14x2.4mm O-rings 20Pcs 16x2.4mm O-rings 20Pcs 18x2.4mm O-rings 10Pcs 20x3.1mm O-rings 10Pcs 24x3.1mm O-rings 10Pcs 25x3.1mm O-rings 10Pcs 26x3.1mm O-rings 10Pcs 28x3.1mm O-rings note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.