OSG Threading Tap - Metric Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - M30 x 3.5OSG's Metric Spiral Flute Threading Tap, built from HSS E and finished with a Steam Oxide coating, is designed for precise blind hole threading in demanding metalworking environments. Suitable for professional shops and those who require reliable, long lasting taps, this tool delivers consistent results at the M30 x 3. 5 size. Material: HSS E (high speed steel with cobalt) for improved heat resistance and durability during tough threading tasks.