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3-in-1 Design:This multifunctional set combines drill bit and tap in one tool,featuring HSS spiral flutes for drilling and tapping in a single step Premium HSS Construction: These tap drill bits are crafted from high-speed steel for exceptional strength and durability.The material retains its hardness even at high temperatures Precision Design: Each tap drill bit features a precision-engineered spiral flute design.This ensures clean,accurate threads every time.Meeting metric standards,this tap and die set is designed for creating M3 to M10 metric threads Convenience and Compatibility:The convenient 1/4 inch hex shank design allows these tap drill bits to work with most standard drill chucks and holders for quick and easy changeovers Wide Application:The set includes 12 drill bits in 6 commonly used sizes(M3,M4,M5,M6,M8,M10),with two bits per size,capable of handling a variety of job requirements