Ratchet Die Stock Head & Handle Components: The red dual-entry head assembly securely hosts the individual circular threading dies. The black extensions join together to provide maximum leverage when rotating the tool manually around a fixed pipe. [1] ( )Threading Dies (6 Pieces): Interchangeable cutting heads of varying dimensions (typically ranging from 1/2" up to 1-1/4" or 2") used to form precise threads on the exterior walls of metal tubes. [1] (