Features: Sharpness and durability, the cutting edge strength is high. Small resistance, smooth chip removal, smooth cutting surfaces, with good machinability, it can tap to the button of blind hole. Flexible to be use, processing efficiency, good stability, widely used, low processing cost, can be applyto a variety of job. Strong hardness and good durability, which greatly improves the cutting performances of the drill, is more wear-resistant and prolongs the service life. Greatly saves processing steps and time costs, improves working efficiency. The tapered end is designed to prevent excessive impacts, and the rear tapered over the tap to prevent thread damage. Specifications: Component:High Speed Steel Specification: 6-32NC, 8-32NC, 10-24NC, 10-32NC, 12-24NC, 1/4-20NC Length:5.7/6.3/7.2cm Package Includes: 6Pcs Tap Drill Bit note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual of the item.