Designed for CNC Lathe applications. Holds boring bars, threading bars, and drills. Coolant forced from the face of the sleeve allows positive coolant contact with the cutting edge at all times, eliminating thermal shock and leaving improved surface finishes. Tolerances hold longer, and speeds on feeds increased. The sleeve allows for shorter tool lengths because you can get closer to the part and still have 100% coolant contact with the cutting edge. The use of the sleeve eliminates the chance of coolant line deflection.