Viking Drill and Tool 29281 Type 280-D Reduced Shank Cobalt Drill Bit, 3/4" M42 Cobalt 1/2-inch Reduced Shank Silver and Deming 135-Degree Split Point 135-Degree split point for accurate centering and fast penetration Precision ground point, flutes, body, clearance and drill diameter for ultimate accuracy and performance M-42 Cobalt contains 8-percent cobalt 1/2-inch shank - 6-inch OAL