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People who need a quick and easy way to cut through tough objects, such as trees, will often purchase a chain saw because of the strength and durability of their cutting blades. Chain saws are usually powered by a two stroke gasoline internal combustion engine which powers the cutting chain. The cutting chain is usually comprised of short metal segments on which small sharp blades are attached. Chain saws are most commonly used in forestry activities such as logging and tree trimming and can be used to remove excess branches and foliage, as well as cutting firewood. Chain saws will often need to be periodically lubricated in order to keep them in optimal working order.
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