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For general use in forestry, tree surgery and firewood cutting, three basic configurations exist. Square chisel chain has a square cornered tooth, splitting wood fibers easily in the cut for fast, efficient cutting in clean softwood. Round chisel chain is the same tooth, but sharpened with a round file instead of a flat file and holds an edge longer in hardwood. Semi-chisel chain has a rounded working corner. While slower than square or round chisel, it retains an acceptable cutting sharpness longer, making it the preferred choice for dirtier wood, hard or dry wood, frozen wood or stump work, all of which would rapidly degrade a round or square chisel chain.
There are also different arrangements of teeth on the chain.
"Full Compliment" chain has a left cutter, drive link, right cutter, drive link arrangement and is used for most applications. "Skip" has a left cutter, drive link, drive link, right cutter arrangement. It has 1/3 fewer cutting teeth and is generally used on long bars (24"+) for added chip clearance or when a bar longer than ideal for a given power head is used. Fewer teeth require less power to operate. "Semi-Skip" is a mixture of the previous two arrangements.
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