🔍 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}. It’s 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 “Long Life” or TAC or SPE-X coating, it means those bits have that bronze or blue-ish colored coating which is a performance enhancer. It’s a nice bonus but doesn’t change how you use the bits – just expect them to possibly outlast uncoated ones. SpeTool bits are carbide, so they’re robust even uncoated, but the coating adds even more durability.

Related product: → View product page