I have been using this type of countersink for over 20 years. Used this bit on plain soft pine and the cheap metal cracked and broke. Not nearly as good as other countersinks from other companies.
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πͺ Bi-Metal Cutting Blades: Imachinist S933414 - Enhancing Precision and Performance
Enhanced Cutting Efficiency with Olson FB23370DB 0 025 2 Inch Blade