Note: 1. Please allow 0‑1 inch error due to manual measurement. Thanks for your understanding.2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard. Features: 1、HIGH COMPATIBILITY Chainsaw cylinder piston spark plug set fits for Husqvarna 55 51, with good compatibility and stable performance, long service life. 2、CHAINSAW PART Cylinder x 1, piston x 1, piston ring x 1, piston pin x 1, piston circlip x 2, spark plug x 1, paper gasket x 3, gasket x 1, fuel pipe x 1, fuel filter x 1, needle bearing x 2, oil sealing x 2, bearing x 2, handle x 1, accessory x 1. 3、ALUMINUM MATERIAL Selected high quality aluminum material, with high hardness, durable to use and wear resistant, fast heat dissipation, long term use. 4、STABLE PERFORMANCE Perfect garden chainsaw accessory, can effectively extend the service life of the machine and can perfectly match your machine. 5、PERFECT SUBSTITUTE Easy