The marking mandrel is a tool for marking and marking the location of the center of the holes, establishing the base of the filler, specifying the length of the lines that are drawn on the workpiece with a ruler needle, etc. The material of the marking mandrel is tool steel and should be The workpiece should be harder so that it can be used to leave an impression on the work. The angle of the tip or the tip of the mandrel is usually chosen to be 60 degrees. The structure of this device is molded in one piece of steel and includes 3 parts: the tip, the conical part, the body and the head. Taking the drill head and creating a small hole on the metal surface is usually at a 60 degree angle.