1 High-quality high-speed steel alloy has longer service life and higher accuracy 2 Smooth cutting 3 Various specifications 4 High hardness, strong performance, clear thread, sharp and easy to use Uses: Used for through-hole drilling and tapping of thin stainless steel, soft steel, iron, copper and aluminum.1 Smoother chip removal and faster cutting efficiency 2 Accurate lock position, convenient operation 3 Grinding thread, sharp and easy to use