Lo pointed Taps That tip taps for through holes and deep thread, the use of high strength, long life, fast cutting speed, dimensionally stable, clean tooth pattern analysis (especially fine tooth), is a variant of a straight groove tap, by Germany NORIS company founder Mr. Ernst Reime was invented in 1923. On one side of the straight groove cutting edge open the chute, forming an angle, along the feed direction of the chip that is discharged forward. For through hole machining.