Features: 1.Application: 44mm chainsaw cylinder piston kit is specially designed for STIHL MS251, please double check the model before purchasing. 2.OEM Number: The part number for reference are 143 020 1207, 1143?020?1207, please confirm whether it is consistent with the OE you need. 3.High Strength Cylinder: Made of die casting aluminum material, the cylinder is solid, wearproof, heat resistant, not easy to deform and crack. 4.Long Service Life: 44mm cylinder can work reliably under harsh conditions, with simple operation, convenient control and long service life. 5.Excellent Replacement: Professional manufacturing, this is your ideal option for your rebuild, repair, and maintenance needs. Specification: Item Type: Cylinder Piston Kit Material: Die casting aluminum OEM: 1143 020 1207, 1143-020-1207 Cylinder Bore: Approx. 44mm / 1.73in Application: For STIHL MS251 Chainsaw Note: 1. Please double check the part number of your item, matching information is for reference only. 2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!