OSG Threading Tap - Metric Spiral Point HSS-E - Steam Oxide Coated - Through Hole - M18 x 2.5Designed for professional machinists, the OSG Metric Spiral Point Threading Tap delivers precise, efficient through hole threading on metric M18 x 2. 5 workpieces. Built from HSS E with cobalt and finished with a steam oxide coating, it stands up to demanding tapping tasks with sustained wear resistance. Material: HSS E (high speed steel with cobalt) for enhanced hardness and heat resistance during long cuts Coating: Steam oxide finish reduces wear