A deep hole drilling tool has several classifications. The most common classification is the "DHD" tool. This type of deep hole drilling tool is used to make holes in rock and other solid material. The axial length of a tool shaft can be longer than the diameter of the work-piece. It also has a guiding and supporting element. It can be arranged for finishing the bottom of a hole or for cutting the wall of the hole according to a cylinder coaxial to the reference hole.
A drilling tool is composed of a base with a central axis and a cutting head. The cutting tool has two convexly-curved centring portions that engage with complementary concave surfaces of the supporting jigs. The drill bit is complemented by a rotary driver with a set screw on its outer peripheral surface. The drill bit is a machined piece. In addition, the tool can be operated with a manual hammer.
The rotary drill can be used for deep hole drilling. This is also called "gun drilling." This tool consists of two types: rotary and non-rotary cylinders. They can be used to drill any material. Among these types, gun drilling is the most common. These two methods differ by the method of coolant entry and chip removal. Secondary tools include trepanning, skiving, and pull boring. Reamering breaks up the chips in the work-piece, allowing for smoother drilling surfaces.