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This STIHL check gauge allows you to keep an eye on sprocket wear at all times and in this way to prevent damage to the saw chain. As you fell trees, chop branches or cut wood to length, the saw chain leaves a trace on the sprocket wheel of your STIHL chainsaw as it passes the drive pinion. This practical sprocket wear check gauge allows you to precisely measure the depth of these grooves. If the depth is more than 1 mm, the saw chain may be damaged and the sprocket should be replaced. It is therefore important that you regularly check the sprocket for wear.