a. Technically, the difference between the outside diameter of a set bit and the
outside set diameter of the reaming shell. Loosely, the term is used to denote
the clearing action of a bit, which is a function of the waterways and the mode
in which the diamonds or other cutting media are set in the cutting face of the
bit, and also the difference between the outside set diameter of a bit and the
outside diameter of the bit shank. Long
