Easy to use: These drill bits are specially designed for electric saw sharpeners. It can be replaced in just 2 steps. In this way, this titanium-coated file has a harder nature and reduces the number of replacements. Quick results: The chainsaw bit is distributed with complete and even particles. These files can sharpen the chain stably and effectively. It only takes a few minutes to the troublesome hand sharpening once and for all. : The hardest titanium wheel we manufacture uses titanium electroplating process, which means that the life of this drill bit is 20% longer than that of other non-titanium electroplating. Note: There may be many black spots on the of the wheel. It is not that the titanium coating falls off, but that the titanium and silicon carbide are mixed. Better use., Manufacturer: Mcnhbdgg