[3-IN-1 MULTIFUNCTIONAL COMBINATION DRILL TAP] They are three-in-one operation, which can drill, tap, deburr and counter holes on wood, copper, brass, aluminum, sheet metal and plastic. One-step processing, greatly save processing steps and time costs, improve working efficiency. Deepening the chip flute helps to remove chips and debris on the tap, reducing friction and heat, thereby achieving a faster and cooler drilling process.[PREMIUM MATERIAL]These high-quality taps are made of Metal and have high hardness to achieve sharpness, fast execution and maintain strength and efficiency. It can be applied to all wood, copper, iron and part of thin stainless steel is also applicable. The surface is treated with titanium alloy to improve the cutting performance and wear resistance of the drill , and extending the service life.[ HIGH VERSATILITY&CONVENIENCE]The product portfolio includes SAE and metric sizes, can meet your various need. Each tap drill is engraved with its size, you can choose the accurate bit without any difficulty.The convenient 1/4inch (6.35mm) hex has a tapered end to prevent excesssive knocks. Back taper exceeds the tap to prevent over-drilling and damage to the thread. It also comes with a portable storage case you can carry and keep the drill neat and tidy.[WIDELY APPLICATIONS]These tap bits are great tools used to create screw threads, to cut or form the female portion of the mating pair. Hex quick change adapter(with lock function, included in Set B & Set C)can fit into most tools more easily and securely for tapping in most materials.[13PCS SIZES]Can be used to tap various threads. 6PC SAE: 6-32NC, 8-32NC, 10-24NC, 10-32NC, 12-24NC, 1/4-20NC; 6 metric:M3 x 0.5, x 0.7, M5 x 0.8, M6 x 1.0, M8 x 1.25, M10 x 1.5; 1 piece-quick change adapter(Included in Set B & Set C).Colour:Gold+SilverMaterial:MetalPackage Contents:13 x Combination Drill Tap Bits SetOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.