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6 Pcs 1/4 Inch Hex Shank Spiral Tap Drill Bit Set Drilling Tapping Chamfering and 1pcs Extension rod. 3 in 1 Tap Drill Bit Set: It is suitable for drilling, tapping and deburring of soft metal, aluminum, iron, thin wood board, plastic board and other materials within 5 mm. They are not suitable for drilling and tap in hard metals or thick metals. It is not recommended to use them for materials thicker than the drill section 6pcs drill tap set including metric M3*0.5 (54 mm), M4*0.7 (54 mm), M5*0.8 (57 mm), M6*1.0 (57 mm), M8*1.2 (59 mm), M10*1.5 (60 mm) Thread Pitch: M3 (0.5mm), M4 (0.7mm), M5 (0.8mm), M6 (1.0mm), M8 (1.25mm), M10 (1.5mm) The data measurement is manual measurement, please allow 0.1mm-0.3mm error. Due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you. Tip: 1,Use a low power and light weight drill driver so that you have a better feel for the control and angle of the bit. 2,Use oil on the tip of the bit and GO SLOWLY when going through soft metal. This allows you to use your tap drill bits multiple times without compromising the quality of the bits. Combination Drill Tap Bits They are sharp and perfect for wooden projects (or other soft materials) and they tap at the same time. Don't have to have separate drill bits for the tap. Don't need a center drill bit or a center punch. High efficiency and time saving.