Specification: Condition:100% Brand New Guarantee Color: As The Picture Shown Size: 18mm Outlet Diameter Fitment:Universal Fit Most of Motorcycle Package Include:2 Sight Glass Lens With 2 Hole Sealing Gasket Washers(4 Pieces Total) Installation: 1)Completely remove old sight glass including metal ring and rubber gasket. Be sure the reservoir is drained of all brake fluid and has been washed 2) Place the rubber seal in the sight glass hole 3) Gently press the sight glass piece in to the hole 4) Cover the face 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 5) Fill with brake fluid, bleed the brakes, and get back to riding safely~! Attention: Please Check The Picture For Compatibility Before Purchase And Allow 1-3mm Error Due To Manual Measurement And Make Sure You Do Not Mind Before You Complete Transaction