🧲PIT HSS Spiral Groove Step Drill Bit 🍀The CBN ground and spiral flutes guarantee quiet running and high cutting performance. Especially the chip flow is optimized, so even long, non-breaking chips will be removed easily. 🍀The optimized chip flow protects the cutting edges and reduces metal debris accumulation. Ideal for stainless steel grades A2/ A4，steel sheet, non-ferrous metals and plastics boring. #pittools #stepdrill #metalworkingtools #stepdrill | PIT Global
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🧲PIT HSS Spiral Groove Step Drill Bit 🍀The CBN ground and spiral flutes gu…
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This ancient drill core shows a spiral groove with a 1-in-60 penetration rate—far beyond what modern tools can do. Chris Dunn refined the numbers, but the mystery remains: How did they cut stone with 500x more efficiency than us? See more from Ben: https://www.youtube.com/@UnchartedX | Cosmic Summit
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