Saw tip slotted type is the most common type in the market, which is generally used for small and medium-sized Hammer & phi; 175 type drill rod, with strong penetration, it is characterized by the force concentrated in a point to break, so that it can produce a strong breaking force, to point to break the surface. It is suitable for road engineering, bridge engineering and all kinds of high hardness rock, concrete and so on. This kind of drill rod is widely used in the whole country.