Features:1.Application: This cylinder piston crankshaft assembly is specially designed for STIHL 029 039 MS290 MS310 390 Chainsaw Crankshaft.2.Characteristic: The cylinder piston crankshaft has the advantages of low wear, low noise, low expansion coefficient, good heat dissipation and low fuel consumption3.Durable Material: The piston cylinder kit is made of steel and iron materials, not easy to wear, and has the characteristics of high strength, rust resistance and aging resistance.4.Stable Performance: High performance chainsaw cylinder crankshaft assembly, not easy to damage, can effectively extend the service life of your machine.5.Nice Replacement: The manufacturing conforms to the standard specification, engine motor cylinder crankshaft is a direct replacement for the old or broken one.Specification:Item Type: Cylinder Crankshaft AssemblyMaterial: Steel + IronCylinder Hole Diameter: Approx. 49mm / 1.93inApplication: Fit for STIHL 029 039 MS290 MS310 390 Chainsaw Crankshaft