13-piece HSS Twist Drill Bit Set, 1.5-6.5mm Alloy Steel Wood

【Robust High-Speed Steel】Made from solid high-speed steel, these high-speed steel drill bits resist heat buildup and maintain their sharpness during repeated use on hard alloys.
【Precision Cylindrical Shank】The precision-ground cylindrical shank, from 1.5 mm to 6.5 mm, fits standard drill chucks, preventing slippage during high-torque rotations.
【Efficient Helical Flutes】Deep helical flutes quickly evacuate debris and chips, reducing friction and preventing binding when drilling in thick cast iron.
【Protective Cobalt Coating】A cobalt coating protects the tool surface from moisture and oxidation, ensuring smooth starts and corrosion resistance on various materials.
【Portable Metal Case】Housed in a labeled metal case that These drill bits secure each drill bit, allowing for quick identification of sizes and safe transport between construction sites.