Viking Drill and Tool 29810 Type 280-UB Magnum Super Prem Reduced Shank Drill Bit, 59/64" Premium 1/2-inch Reduced Shank Heavy Duty 135-Degree Split Point 3-Flats on Shank 135-Degree split point for accurate centering and fast penetration Precision ground point, flutes, body, clearance and drill diameter for ultimate accuracy and performance Special Hi-Molybdenum tool steel 1/2-inch shank - 6-inch OAL