🔍 Carbide spiral bits are known for their long life, and SpeTool’s are additionally enhanced with advanced coatings (like the SPE-X nano-coating) to extend life further:contentReference[oaicite:13]{index=13}. Many users report that even with regular use, the bits stay sharp through hours of cutting:contentReference[oaicite:14]{index=14}. The actual lifespan will depend on what you cut (e.g. MDF is more abrasive than pine) and how aggressively you cut. With proper use (correct speeds/feeds and avoiding nails or screws), you can expect a long service life – often measured in dozens of projects or many hours of run-time on a CNC. And even when they eventually dull, you can often have carbide bits sharpened. Overall, they have an excellent reputation for durability, especially given their reasonable price point.

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