3 straight fluted taps = taper tap, second tap and bottoming tap (for coarse threads) or of 2 taps = taper and bottoming tap (for fine threads). Sets NP with stepped pitch diameter, taper tap No. 1 with guiding pilote.
- Specification: taper tap No. 1 with one small black ring in front of the square
- Second tap No. 2 with 2 small black rings in front of the square
- Bottoming tap No. 3 - can be used as single tap, therefore without any ring
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