Sharp Spiral Flutes Sharp Spiral flutes provide neat and smooth cuts. High cutting edge strength, fast cutting speed. Spiral groove facilitates the export of metal chip, saving time and effort in operation. Tips The longer the length of the tool clamped by the chuck, the better. If the clamping length is shorter, you need to lower the feed rate and cutting speed to reduce vibration and extend the tool life. Combined with the material to be processed, select an appropriate feed rate and cutting speed to improve the tool life and obtain better processing accuracy and performance. Reduced Shank Drills Reduced shank drills expand the size range capacity of a portable drill chuck. Common flute and overall length for minimal adjustment during tool changes. Wide Applications Can be used for drilling stainless steel, aluminum alloy, iron, copper, brass, metal, wood and plastic materials. Perfect tool for maintenance departments, machine shops, and other industries.Suitable for hand drill, table drill processing equipment, etc.. Suitable Lubricant is conducive to cutting or cooling, making cutting easier, improving smoothness and dimensional accuracy. It can help to extend the service life of tools in tapping operations.