♬This 3 pack hexagonal helical countersink drill bit set features a shank that triples lifespans and boosts cutting efficiency, solving slow drilling with its superior hardness and high speed steel construction for efficient . ♬Designed with a three flute helical structure and a 6.35mm hexagonal shank, these bits ensures stable gripping and precise water pipe expansion from 15~31mm, made from sturdy alloy for accurate punching in various materials. ♬Ideal for electricians, plumbers, and craft enthusiasts, this tool helper in demanding tasks like plumbing repairs, offering enhanced grip and reduced slippage for efficient workflow. ♬Perfect for scenarios such as water pipe repairing, reaming, woodworking, and soft metal drilling in homes renovations, furniture assembly, or industrial projects, ensuring versatility across applications. ♬The built in tip minimizes wobble for accurate starts, while compatibility with most drills enhances and speed, making it a must have for any drilling set requiring accuracy and durability.