Drill Bit Size Inch: 21/64in Drill Point Angle Degrees: 135 Drill Bit Material: High Speed Steel Drill Bit Finish/Coating: Gold Finish Flute Type: Spiral Cutting Direction: Right Shank Type: Straight Coolant Through: NoThese Premium HSS drills can be used in a variety of applications. Their surface treatment increases abrasion resistance, which reduces the amount of chip welding and improves chip flow. 30 degree helix angle 135 degree split point