"The Gnutti Bortolo HSS threading range includes taps with different chamfer lengths (taper, second and bottom lead) and taps with incomplete thread profile, also known as serial taps. These have lower pitch and outer diameter compared to standard, as well as longer chamfer. Left hand option also available as well as TiAIN coating option.
Available in singles or sets (comprising of taper, second & bottom lead or bottoming taps). M Metric coarse threads according to DIN 352 norm."