Features: 1.OE Number: The referencing OE number of this cylinder piston kit are 1123 020 1209, 1123 030 0408, which is molded and designed depend on the original data. 2.Fitment: The engine motor cylinder piston is a replacement for Stihl MS250 MS230, please check the model of your chainsaw before ordering. 3.Parameter: The bore diameter of this cylinder is 42.5mm/1.67in, made of high strength die cast aluminum material, which is wear resistant, impact prood and durable. 4.High Performance: Low noise, low expansion coefficient, improved heat dissipation, strong power and low fuel consumption, lower friction surface as well as long service life. 5.Easy Installation: Easy to install, no modification, cutting, or drilling required. It adopts original standard, which is a perfect replacement and can perfectly match to your car. Specification: Item Type: Cylinder Piston Kit_x000D_ OE Number: 123 020 1209, 1123 030 0408_x000D_ Material: Die cast aluminum_x000D_ Cylinder Diameter: Approx. 42.5mm/1.67in_x000D_ _x000D_ Fitment:_x000D_ Replacement for Stihl MS250 MS230 PackageList: 1 x Cylinder 1 x Piston 2 x G Ring 1 x Pin 2 x Gasket 1 x Base Note: Please double check the part number of your item, matching information is for reference only._x000D_ If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!