8Pcs chainsaw bits, titanium plated, specially designed for electric saw sharpeners, can sharpen the chain stably and effectively. Specifications: Material: Titanium coating Color: Gold Diameter: 4mm(5/32"), 4.8mm(3/16"), 5.5mm(7/32") (optional) Quantity: 8Pcs Package Weight: 4mm: 22.3g / 0.79ounces 4.8mm: 33.1g / 1.17ounces 5.5mm: 44.7g / 1.58ounces Package 70 * 40 * 20mm / 2.76 * 1.57 * 0.79in Note: There may be many black spots on the surface of the wheel. It is not that the titanium coating falls off, but that the titanium and silicon carbide are mixed. Better use. Packing List: 8 * Chainsaw Bits 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 get rid of the troublesome hand sharpening once and for all. The hardest titanium wheel uses titanium electroplating process, long service life. These drill bits are specially designed for electric saw sharpeners. It can be replaced in just 2 steps. Generally speaking, 4.0mm diameter fit for electric chain saw, 4.8mm diameter fit for small chain saw, 5.5mm diameter fit for large chain saw.