1Fit Models: Exhaust muffler kit replacement for Stihl 064 065 066 MS640 MS650 MS660 chainsaws and you need buy it with carefully know the type. 2Main Function: Exhaust muffler set with high quality parts are used to reduce the noise generated by the chain saw engine and easy to use. 3High Quality Material: Exhaust muffler kit is made of high quality metal material, durable and wear resistant, and has a long service life. 4Good Performance: Exhaust muffler kit with professional manufacturing, superb craftsmanship and high precision help to provide the best performance. 5Complete Package: Kit includes 1 Exhaust Muffler, 1 Muffler Gasket, 2 Spline Screws M5x6, 2 Spline Screws M5x16, 2 Spline Screws M6x20.Item Type: Exhaust Muffler KitMaterial: IronReplace OEM: 1122-140-0614, 1122-140-0604, 1122-140-0613Fitment: Replacement for Stihl 064 065 066 MS640 MS650 MS660 Chainsaws 1 x Exhaust Muffler1 x Muffler Washer2 x M5 x 6 Slot Screws2 x M5 x 16 Slot Screws2 x M6 x 20 Slot Screws