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. Item Type: Cylinder_x000D_ Cylinder Material: Die-cast aluminum_x000D_ Piston Material: Aluminum_x000D_ Cylindrical Pin Material: Alloy steel_x000D_ Piston Ring Material: Ductile iron_x000D_ Circlip Material: 65Mn_x000D_ Cylinder Coating: Chrome plating_x000D_ Piston Diameter: Approx. 48mm / 1.89in_x000D_ Specifications: For 61 cylinder assembly 1 x Cylinder1 x Piston1 x Cylindrical Pin1 x Piston Ring2 x Circlip2 x Cylinder Gasket The diameter of the piston is 48mm, please pay attention to the reference before buying.