Feature:1. Made of diecast aluminum, cylinder is with guaranteed quality, which can be used in confidence.2. Equipped with good wear resistance and long service life, such cylinder and piston of precision parts is cast by special materials.3. Not easy to damage, piston is manufatured by aluminum, installed in an easy way.4. Due to compact structure and high hardness, this cylinder assembly is entitled with high performance according to strict rule.5. General cylinder piston assembly and complete set accessories are fit for 61 gasoline chain saw.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. 48mm / 1.89inSpecifications: For 61 cylinder assembly.Package List:1 x Cylinder 1 x Piston 1 x Cylindrical Pin1 x Piston Ring2 x Circlip2 x Cylinder GasketNote:The diameter of the piston is 48mm, please pay attention to the reference before buying.