Hole hole saw (hole saw) as walking beam pumping units  he serrated material classification: the bimetal hole saw, carbide hole saw, diamond hole saw,, tungsten carbide hole saw, different materials for cutting materials is not the same, the most common is Downhole Stabilizers double metal hole, we recommend the use of a harder metal material carbide hole saw, glass, carbon fiber, ceramics and other pieces of fissile material recommended diamond hole saw.