Depth gauge setting being a major factor affecting any saw chain's level of safety and performance, this depth gauge filing kit including .025 drop-center depth gauge tool and flat file helps the setting easily. Makes accurate, consistent depth gauge settings easy.Flat file is made from fine steel that is heat-treated for maximum lifeTool set depth gauge to the recommended .025 inch depth for 3/8 inch low profile, .325 inch and 3/8 inch pitch saw chain