Compatible with Husqvarna 340 345 350 ChainsawReplace OEM Part No. for 503910501, 503 91 05-01,503850901, 503 850 901, 537 25 30 02, 537253002, 503 87 96-02, 503879602, 537 02 40-02, 537024002, 537 04 30-01, 537043001, 503 89 83-01, 503898301Cylinder Bore Diameter:44mmWrist Pin Diameter:10mmInclude:1 x Engine Cylinder Cover, 1 x Chain Brake Handle, 1 x Cylinder Head, 1 x Piston, 1 x Pin, 1 x Ring, 2 x Circlip, 1 x Decompression Valve, 1 x Exhaust Muffler, 1 x Muffler Bracket, 1 x Muffler Gasket, 1 x Cylinder Gasket, 1 x Air Filter, 1 x Brake Band, 1 x Handlebar Shock Spring, 1 x Spark Plug(Attention: This kit do not include cylinder bottom, please order it separately if you need.)