STM Premium 1/2" x 14-1/2" OAL MT3 118º Notched Point HSS Extra Length Taper Shank Oil Hole Drill
Oil hole drills feature coolant passages throughout the length of the body. These allow a coolant (air, oil, or vapour mist) to reach the cutting edges. The resulting flow cools and lubricates the cutting edges and also aids in the extraction of chips.