Stihl file gauge for checking the top plate and side plate angles while you sharpen your chainsaw chain. Marked recesses show the correct sharpening angles and tooth position, the U-shaped end sets the depth gauge height, and you can also check tooth length. The pointed end has a millimetre scale for measuring guide bar groove depth and doubles as a tool for clearing sawdust from the groove and oil inlet holes. Choose the gauge that matches your chain pitch.