Aloris ATB Series threading bars can be used for internal right or left hand threading. Available in five sizes, these bars accommodate standard triangular-shaped throwaway threading inserts in a hardened seat.

The ATB Series shank has three flat sides specially designed for use in Aloris boring bar holders # 1, # 2, # 13,  #4 and # 41. They may also be used in any Aloris boring bar holder. Excellent for CNC machines.