Precise H.S.S. Combined Tap & Drill

• Drill & tap in one step.
• 25 degree Helix provides proper cutting action for both drlling and tapping.
• 118 degree self-centering helical point eliminates the need for center punching or center drilling.
• Reduces the thrust required. H-2 pitch diameter for 4-40 NC, all other are H-3