Flexible to be use, processing efficiency, good stability, widely used, low processing cost, can be applyto a variety of job Greatly saves processing step and time costs, improves working efficiency The tapered end prevents excessive impacts, and the rear tapered over the tap to thread damage Strong hardness and good durability, which greatly improves the cutting of the drill, is more wear-resistant and prolongs the service life Sharpness and durability, the cutting edges strength is high Small resistance, smooth chip removal, smooth cutting surfaces, with good machinability, it can tap to button of blind hole, Manufacturer: Xjdzineq