This listing is for set of 4 BRAND NEW Aftermarket Carburetor Diaphragms (only the rubber parts). It does not include anything else than that. They should fit HITACHI HSC32 and HITACHI HSC33 carburetors. THEY WILL NOT FIT MIKUNI and KEIHIN CARBS! These are definitely the best quality aftermarket replacement parts you can find on the market and they are petrol, ethanol and chemicals resistant.