Expandable multi-flute reamer with tapered pin

An expandable reamer having a longitudinal axis, comprising:

• a shank portion;
• a cutting portion extending from the shank portion, the cutting portion including a plurality of blades separated by flutes, the cutting portion including a tapered inner surface with threads, the cutting portion further including at least one coolant channel extending from a coolant cavity through a wall of the cutting portion for providing a supply of fluid to the blades;
• and
• a tapered pin including a tapered outer surface with threads, the tapered pin capable of being at least partially received within the cutting portion, the tapered pin causing an expansion or contraction of the cutting portion when the tapered pin is screwed or unscrewed into the cutting portion,
• wherein a length of the tapered pin is such that the tapered pin does not extend into the cutting portion far enough to reach the at least one coolant channel, and therefore, does not interfere with the supply of fluid through the at least one coolant channel.