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5/8 SPIRAL BURR

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Great for Pocket Ports and Full ports!


  • does NOT work on cast iron or steel of any kind
  • can leave a smooth finish at low speed
  • very versatile 
  • Made from Carbide not cheap steel that chips or bends easily
  • intermediate skill level


Dave's Take:

The 5/8 burr is my go to for roughing out many ports and even pocket ports. I have multiple of these because I cut the to different lengths depending on how hard I am going to be porting, or if the runner is long or short.

Pocket port, I would use a short 4 inch, I do this because I want to be close to the subject. For a runner I use the whole 6 inch length so I have the most leverage. 

When doing a full port, I use the 5/8 or 3/4 to rough it out and then go over it with the 1/2 at full speed and then again at slow speed or switch to the 3/8 double cut burr for a smooth finish on a pocket port (never use the 3/8 for a full port).

Be sure to check out our useful YouTube tutorials on using these burrs! 

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