I have never used ring crowns. I can only say WOW! I have never seen such a faceted standard spiral nozzle! I bought these along with a Bluerock Tools Model BRM-35A Magnetic Base Drill I just bought. Honestly, I wish I had these two themes for all the work I've done over the past forty years! Money well spent! These things go through 5/8 inch steel plate faster than you can believe.
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