Description A perfect completely replace your old sight glass and is easy to install Comes with the proper gasket for sealing in the brake fluidSpecification Material Gasket RubberRing MetalSize Gasket Diameter 9mmInside Diameter of Ring 9mmOutside Diameter of Ring 1OmmHeight of Ring 4mmType Other brakes and suspensionPlacement on Vehicle FrontFits many brands and modelsFitment For the clutch or brake master cylinders used on motorcycles ATVs scooters etc Installation Remove old sight glass including metal ring and rubber gasket Be sure the reservoir is drained of all brake fluid and has been washed Place the rubber seal in the sight glass hole Gently press the sight glass piece in to the hole Cover the lens with a soft cloth or towel to prevent damage and carefully tap into place with a hammer Check to make sure the face is flush and even with the font face Fill with brake fluid bleed the brakes Note 1 We provide clear pictures measurements where possible Please check as much as possible to make sure the item is the one that you need 2 Please allow 0 5 1 inch difference due to manual measurement 1 inch 2 54cm 3 There are no instructions included in this kit 4 Master cylinder is not included just the sight glassrubber gasket 5 No need to buy an entire master brake reservoir and cylinder just because the sight is broken Get this replacement and get back to riding Package Included 1 X Sight Glass