Europa Threading Tap - Spiral Point - Interrupted Thread - Metric Coarse - PM - Purple Ring - M18 x 2.5The Europa Threading Tap is a precision tool for engineers and machinists who regularly create metric threads in through holes. Its spiral point, interrupted thread geometry is clearly marked by a distinctive purple ring for quick identification in busy tool cribs. Size: M18 x 2. 5 (metric coarse) Thread Type: Spiral Point with interrupted thread geometry designed to push chips forward and maintain steady cutting in through hole applications. Thread