Features: Brand new and high quality Packed in 200pcs rubber o-rings, in 15 commonly used size. The quantity is enough to meet daily needs,have long-terms use. O rings gasket kit selected from nitrile rubber, oil resistant, heat resistant up to 120℃. The rubber washer seals soft and flexible, easy installation. reduce pressure and protect part and screws,Suitable for most plumbing and general repair needs. These rubber Spacers gasket washers widely used on home and workplace,great for general plumbers, car, door, window, garages,etc. O seals rings set store in one plastic box, which stick one size. It can save your effort in tidying up and choosing right size.Convenient for storage and picking. Specifications: Material:Butyronitrile Rubber Package Includes: 20Pcs 6x1.9mm O-Rings Gasket 20Pcs 7x1.9mm O-Rings Gasket 20Pcs 8x1.9mm O-Rings Gasket 20Pcs 9x1.9mm O-Rings Gasket 20Pcs 10x1.9mm O-Rings Gasket 15Pcs 12x2.4mm O-Rings Gasket 15Pcs 14x2.4mm O-Rings Gasket 15Pcs 16x2.4mm O-Rings Gasket 15Pcs 18x2.4mm O-Rings Gasket 15Pcs 20x2.4mm O-Rings Gasket 5Pcs 24x3.1mm O-Rings Gasket 5Pcs 25x3.1mm O-Rings Gasket 5Pcs 26x3.1mm O-Rings Gasket 5Pcs 28x3.1mm O-Rings Gasket 5Pcs 30x3.1mm O-Rings Gasket note: 1.Please allow 1-2cm errors due to manual measurement, make 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.