Feature:1. Practical, chainsaw piston can be used with confidence, meanwhile, it keeps guaranteed quality.2. Due to compact structure and high hardness, this cylinder assembly is entitled with high performance according to strict rule.3. Fit for 51 gasoline chain saw, exquisite craftsmanship entitle general cylinder piston assembly and complete set accessories with high performance.4. Not easy to damage, this chainsaw cylinder can be used for a long time, which also supports easy installation.5. Good wear resistance helps this cylinder and piston with long service life, which is cast by special materials.Specification:Item Type: CylinderCylinder Material: Die-cast aluminumPiston Material: AluminumCylindrical Pin Material: Alloy steelPiston Ring Material: Ductile ironCirclip Material: 65MnCylinder Coating: Chrome platingPiston Diameter: Approx. 45mm / 1.77inSpecifications: For 51 cylinder assemblyPackage List:1 x Cylinder 1 x Piston 1 x Cylindrical Pin1 x Piston Ring2 x CirclipNotice:The diameter of the piston is 45mm, please pay attention to the reference before buying.