Item Type: Cylinder Kit Material: Aluminum Alloy + Iron + ABS Color: As shown in the picture Cylinder Bottom Hole Diameter: Approx.44mm / 1.73in Replace Part Number: 1143 020 1207,1143-020-1207 Weight: Approx. 839g / 29.6oz Application: Suitable for Stihl MS251 Chainsaw 144mm cylinder piston kit with air filter oil seal fuel line primer bulb set, perfectly fit for Stihl MS251 chain saw. 2Practical chainsaw accessories, easy to install and disassemble, can directly replace old or damaged parts. 3Use high quality Aluminum alloy, iron, ABS materials, durable, wear resistant, and long service life. 4Professional manufacturing, exquisite craftsmanship and high accuracy help to provide the best performance. 5Perfect accessories for garden tools, stable performance, can perfectly match your machine and improve working efficiency.1 x Cylinder1 x Piston Kit (6 pcs)1 x Air Filter2 x Oil Seal1 x Sparking Plug1 x Primer Bulb1 x Needle Bearing1 x Fuel Filter2 x Fuel Line 1. Please allow 1?2in 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.