Metric Tap and Drill Bit Set Combination HSS Blue Coating Twist Drill Tap Combination Bit Set 6PCS with 1/4” Hex Shank Spiral Flute

·        DURABILITY: Combination drill tap bit is made of high-quality High-Speed Steel 6542. Strong hardness and good durability, which greatly improves the cutting performance of the drill, is more wear-resistant and prolongs the service life. They're sharp, and easy to use.   ·        3 in 1 Tap Bit Set: It is suitable for drilling, tapping and cutting of light 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. One-step processing, greatly saves processing steps and time costs, improves working efficiency. The tapered end is designed to prevent excessive impact, and the rear tapered over the tap to prevent thread damage.