π TAC is the proprietary coating SpeTool uses (likely similar to TiAlN or a high-performance nano-coating) branded as **SPE-X** coating. Some sets, like the 10-piece one, advertise that the bits are TAC coated for longer life:contentReference[oaicite:70]{index=70}. This coating can give up to 2.5 times the tool life and improved edge smoothness:contentReference[oaicite:71]{index=71}. Itβs basically an extra feature that reduces friction and heat during cutting. In practice, coated bits can last longer especially in abrasive materials (MDF, plywood) or when running the bits hard. So if you see a set highlighting βLong Lifeβ or TAC or SPE-X coating, it means those bits have that bronze or blue-ish colored coating which is a performance enhancer. Itβs a nice bonus but doesnβt change how you use the bits β just expect them to possibly outlast uncoated ones. SpeTool bits are carbide, so theyβre robust even uncoated, but the coating adds even more durability.
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