Single-edged gun drill is the common and widely used type of gun drill. The drill bit is divided into integral sintered carbide drill bit and carbide inserts-piece steel drill. Drill stem and drill stock are heat treated. Drill bits, drill stems and drill stocks are welded as a whole. 

 Gun drill repreasents the advanced and efficient hole processing technologies. It is not only used to process deep holes( ratio of depth to diameter is more than 10), but used to process precision shallow holes. It consists of drill stock, drill stem and drill bit which are all welded together. The hole in the middle is the channel through which the cutting fluid enters the cuttng area and the chips are removed outside by a V-shaped groove