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Drill tap bits increase efficiency of operation by allowing for drilling and tapping to be accomplished in a single pass. These HSS drill and tap bits are great tools used to create screw threads, to cut or form the female portion of the mating pair. They are used on a machine to do the tapping, such as a lathe. Specification: Material: High Speed Steel (Titanium Coated) Standard: Metric, Inch Color: Metric: Gold, Inch: Silver Hex Shank: 6.35mm(1/4") Metric Size: M3*0.5mm, M4*0.7mm, M5*0.8mm, M6*1mm, M8*1.25mm, M10*1.5mm Inch Size: 1/4-20NC,12-24NC,10-24NC,10-32NC,8-32NC,6-32NC Quantity: 12pcs Weight: Approx. 192g Package List: 12 x Thread Tap 1 x Red Case