The twist drill bit part is forged with high quality 9341 steel. After quenching and heat treatment, it has high hardness and good wear resistance. The twist drill bit uses a large eddy current design to widen the flutes and increase the stability and wear resistance of the bit. 1/2 round handle, mainly used for boring and countersinking, iron processing, steel, plastic, wood, copper, aluminum and other metal materials. The cutter head adopts scientific design, precision grinding technology, good resistance to wear, high temperature resistance, non-stick and durable knife. We strive to provide you with the highest quality product and the best customer experience. If you are not completely satisfied, do not hesitate to contact us at any time.