ET Metric Coarse HS Ground Thread Spiral Flute(6H TOL) ETCTSFT-3.5mm*0.6mm have dia and pitch 3.5mm*0.6mm are identical with the standard hand tap. However, the spiral point tap has the cutting face of the first few threads cut at a pre-determined angle relative to the tap's axis angle to force the evacuation of chips ahead of the cutting action. This feature, plus the excellent shearing action of the flute, make spiral pointed taps ideal for production tapping of through holes. Typically, this type of tap has a shallower flute passage than conventional taps.