Feature:Designed with spiral flutes, better chip clearing process.Self-centering point, do not need assistant center drilling or center punching. Complete hole drilling, tapping, deburring and countersink in one operation with power drill, saves labor and time.Suitable for drilling, tapping, cutting on wood, soft metal, aluminum plate, iron, plank, plastic etc. NOTE: Hex shank drill bit is suitable for rapid drilling and tapping. It is recommended to use with tapping machine. The material's temperature will get very high during drilling, please add some water or coolant to avoid it get smoke. Specification:Material: HSS (High Speed Steel) Surface Treatment: Blackening FinishPitch: 1.25Thread Size: M8Hex Shank Side Width: 6.3mm / 1/4 inchThread Length: 32mm / 1.25 inchTotal Length: 68mm / 2.68 inch Package Content:2 x Twisted Tap Drill Bit