1Practical, chainsaw piston can be used with confidence, meanwhile, it keeps guaranteed quality. 2Due to compact structure and high hardness, this cylinder assembly is entitled with high performance according to strict rule. 3Fit for Husqvarna 51 gasoline chain saw, exquisite craftsman entitle general cylinder piston assembly and complete set accessories with high performance. 4Not easy to damage, this chainsaw cylinder can be used for a long time, which also supports easy installation. 5Good wear resistance helps this cylinder and piston with long service life, which is cast by special materials.Item Type: Cylinder Cylinder Material: Die-cast aluminum Piston Material: Aluminum Cylindrical Pin Material: Alloy steel Piston Ring Material: Ductile iron Circlip Material: 65Mn Cylinder Coating: Chrome plating Piston Diameter: Approx. 45mm / 1.77in Specifications: For Husqvarna 51 cylinder assembly 1 x Cylinder1 x Piston1 x Cylindrical Pin1 x Piston Ring2 x CirclipThe diameter of the piston is 45mm, please pay attention to the reference before buying.