File Length: 6"File Thickness: 1/8"File Shape: RoundFile Cut: Knurl CutPattern: AmericanTighten Tension on Chain to Firmly Support Cutters When FilingFile From Inside to Outside Of CutterPlace File Against Beveled Cutting Surface Of Teeth 20° to 45° with SawSharpen All Left Hand Cutters on One Side Of Chain, Then Move to the Other Side and File All the Right Hand CuttersCheck Depth Gauge Height Every 2 or 3 Sharpening'sHeight Between Cutting Teeth and Depth Gauge is Between .020" to .030"