Hss Drill Tap Bit Set 13Pcs,Beqell Sae/Metric Combination Drill, Countersinking HSS Drill Tap Bit Set 13pcs,BeQell SAE/Metric Combination Drill Tap Kit,Titanium Coated Drill Bits with Quick Change Adapter for Drilling, Tapping, Deburring,Countersinking ?Package Includes?-Total 13pcs Drill tap bit set. 6pcs SAE:1/4-20NC,12-24NC,10-24NC,10-32NC,8-32NC,6-32N;6pcs Metric:M3x0.5,M4x0.7,M5x0.8,M6x1.0,M8x1.25,M10x1.5;1pc Quick Change adapter and storage case;Suitable for most commonly used screw tapping. ?3 in 1?-Drilling, tapping, deburring and countersinking on copper, brass, aluminum, metal sheet and plastic in one step, greatly save processing steps and time costs, and improve work efficiency. ?1/4" Hex Shank?-Unique back-tapered design protects against thread damage from over-drilling, while the sturdy hex shank ensures a strong connection to the drill chuck. This tap drill-bit set also includes a quick-change adapter for effortless bit changes. ?Premium High-Speed Steel?-Made of high speed steel, treated with a titanium alloy on the surface,inreases hardness, wear resistance and durability,provides longer service life.Spiral Groove Design helps to chip quickly,improves drilling efficiency. ?High Compatibility?-They can be used with electric drill, bench drill, drill press and tapping machine (If you choose a electric drill, please drill vertically and do not swing from side to side. The drilling feed speed should not be too fast,Recommended 2000-5000 RPM,MAX 5000 RPM). Notice: Only flat drilling mode can be selected, impact and hammering modes cannot be used.