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% lifetime of these bits than others non-titanium-plated. EASY TO : 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 you have to replace it. Note: There may be many black spots on the surface. It's not the titanium coating has fallen off, but the titanium and silicon carbide mixed. This is better for using. SUITABLE: 3/16 inch wheels for 0.325 inch chain, big 3/8 chainsaw chain. Material:Emery colour:Gold Package Contents: 8 * Burr grinding stone file 3/16 inch Only the above package content, other products are not included. Note: Light and different displays may the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.