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 OE Number: 123 020 1209, 1123 030 0408 Material: Die cast aluminum Cylinder Diameter: Approx. 42.5mm/1.67in Fitment: 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. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!