M35 cobalt-containing twist diamond Second-open stainless steel HSS-co contains 5% cobalt High hardness, fast chip removal and strong wear resistance Professional drilling is widely used It can be used for drilling stainless steel, aluminum, copper, iron, steel plate, etc The borehole is not easy to slip The 135° double backing angle is self-centering Sharp and durable, stable feeding Threaded flutes Thread technology, spiral large groove design; Good chip removal performance Effectively increase the cutting speed and significantly improve the work efficiency. Universal round shank Universal round shank, clamping fastening without slipping