Taps and Drill Bit Set - Premium 6542 high-speed steel helical taps with nitride coating for rust resistance. Fast cutting, high-temperature resistance, and longer service life. Smooth Cutting - The spiral groove helps remove dirt and prevents the tap from breaking easily. Good tapping and drilling performance, high precision, and speed improve work efficiency and quality. Chip evacuation design - Helical groove taps are good for threading, fast with high precision, smooth chip evacuation, a smooth cutting surface, no residue, and good machinability; they can tap blind holes. Widely used - For drilling all through-hole applications in low-carbon steels, stainless steel, alloy steels, aluminum, copper, metal, and wood. Included in delivery: The tapping tool kit contains M3, M4, M5, M6, M8, M10, and M12 taps, which perfectly meet your various needs. Features: High-quality high-speed steel, high hardness with good durability. Nitriding coated surface for a durable finish. Rust-resistant.