Presto UK Metric Plug Taps HSS Choice from M2 - M12 (2mm - 12mm)

Quality High Speed Steel as you would expect from Presto Tools

Used for cutting internal threads, 

Straight Flute full size taps used as machine taps

Hand tap sets for tapping in free cutting steel upto 800N/mm2.

The perfect form threas is generated by a combination of effective pitch diameter,

Major diameter and chamfer length