Specification Material: Gasket:Rubber Ring:Metal Size: Gasket Diameter:9mm Inside Diameter of Ring:9mm Outside Diameter of Ring:18mm Height of Ring : 4mm Type: Other Brakes and Suspension Placement on Vehicle: Front Fits many brands and models Fitment: For the clutch or brake master cylinders used on motorcycles,ATVs, scooters, etc. Install: 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. Package included: 2x sight glass Dearbuyers,weappreciateyourbusiness,ifyouaresatisfiedwithourservice. pleaseleaveusapositivefeedbackandratethedetailsofthetransaction(DetailedSellerRatings)witha "PERFECT5STARS". Ifyouhaveanyproblems,broken,qualityproblems,pleasedon'tworry,anddon'tleavebadfeedback. Pleasesendusanemailfirst,wewillreplyyouassoonaspossible,pleaseallowustorespondwithin12hours. Weunderstandyourmood,andwillprovideyouwiththebestsolutionforyourproblem, pleasegiveustheopportunitytosolvetheproblem, Foranycase,pleasefeelfreetocometous,wearealwayshere. lookforwardtoandthankyouforyourtrust.