The cobra petrol chainsaw range is superb quality at a very competitive price the models in the range are fitted with quality components including a walbro carburettor and oregon bar and chain.the cobra air cooled petrol engines are featured on all the models and vary in capacity from 42cc up to 62cc. Choose the correct size of saw for your requirements 14 inch, 16 inch, 18 inch or 20 inch. Comfortable controls and handle make the cobra saws safe and easy to use for all homeowners.the cobra cs520 18 is a large scale petrol saw with an 18 inch 45cm cutting bar and 52cc 2 stroke engine. A petrol chain saw with this size guide bar is suited to more demanding cutting tasks. The cobra cs420 18 comes complete with a carry bag. The improved magnesium alloy crankcase has reduced the overall weight of the saw by 30%.specificationsmodel cobra cs520 18guide bar 18 inch 45cmchain brand oregonengine cobra 2 stroke air cooledengine capacity 52ccstarter pullwalbro carburettor yessafety chain brake yeswarranty manufacturer's 2 year domestic