FAST RESULT: Because there are full and evenly distributed particles on the chainsaw bits, these files can sharpen the chain saw chain steadily and efficiently. Only a few minutes, troublesome hand sharpening once and for all. DURABLE: The latest, hardest titanium-plated Diamond Wheels we'e ever made, adopted titanium plating process, which means you will enjoy 20 percent longer lifetime of these bits than others non-titanium-plated. EASY TO USE: These bits are specially designed for Electric Chainsaw Sharpener. Only 2 steps to replace. By the way, this titanium-plated files have harder nature, which reduces the number of times you have to replace it. Note: There may be many black spots on the wheel surface. It's not that the titanium coating has fallen off, but that the titanium and silicon carbide mixed. This is better for using. SUITABLE: 3 or 16 inch wheels for 0.325 inch chain, big 3 or 8 chainsaw chain. Material:Emery colour:Gold Package Contents: 8 x Burr grinding stone file 3 or 16 inch Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is 1-3cm.