OSG Threading Tap - Metric Spiral Flute HSS-E - Steam Oxide Coated - Blind Hole - M18 x 2.5The OSG Metric Spiral Flute Threading Tap is a high performance tool crafted for forming precise internal threads in blind holes. Designed for machinists and fabricators who demand reliable results in challenging materials, it balances durability with finishing quality to empower productive, consistent threading tasks. Thread Size: Metric threading for M18 x 2. 5 internal threads in blind hole applications. Material: HSS E (high speed steel with