2.Hand tap used to work internal threads by manual operation with precision of H4,

3.Machine tap used to work internal threads on machine tools with three grades of precision: H3,H2 and H1. Single and group supplement are available.  Countersinks with flutes

4.Used for drilling holes with chamfered edges or 60, 90 taper hole.Able to drill taper holes in one operation, especially for small cutting depth machining. hand reamers

5.Mnual articulating internal hole with three types of precision H7,H8 and H9.