1Combine drill bit and screw tap in one, high efficiency and handy. 2These screw taps are made of high speed steel and the surface is nitrided for high hardness and rust resistance. 3Titanium coating allows the tool to drill and tap on harder material. 41/4 hex shank can be installed into bench drill, power drill. 5Spiral flute design for improved chip removal effect. Item Type: Hex Shank Screw Tap Drill Bit Material: High Speed Steel Opening Type: Blind Hole Tap Style: Spiral Flute Thread Type: Coarse Thread Type: Machine Tap Accuracy: H2 Options: M3-2.5, M4-3.3, M5-4.2, M6-5, M8-6.8, M10-8.5 border: 1px solid000important;}10 x Screw Tap Drill BitPlease note that the new type and old type of this product will be sent randomly, and make sure you will not mind before ordering.