Easy to use The insulated plastic sleeve ensures safe operation, it can be easily screwed onto an electric grinder and can easily sharpen chains and serrated blades. Use with an electric grinder This product is an electric grinding attachment that must be used with an electric grinding machine. Flexible operation, adjust the polishing angle. Your chainsaw will be sharp and will only take a few seconds. You can quickly and easily sharpen the chain without removing it. High hardness Made of high quality plastic and metal, the high speed steel grinding heads are characterized by high hardness, durability. High wear, high heat resistance and impact resistance, so you don't have to worry about damaging them. Convenient This chainsaw sharpener is not only fast but also precise. This special kit is a quick and easy way to sharpen slow cut matte chainsaws, a simple guide to adjust the sharpening angle for more precision. Keeps the saw chain oiled for less friction and longer life. Function Accessory guides provide the best sharpening angle. This special kit allows you to quickly and easily sharpen slow-cut foam chainsaws. There are 2 pieces in the pack, the colors are black and red.