The handheld power tool that used to sharpen tools and cut through metal is called the angle grinder. They are found in the wood shop, carpentry industry and even sometimes used during emergency rescue operations where metal must be cut through. The angle grinder uses a rotating disk to perform a particular function. There are different kinds of disks that can be used for different purposes. For example there are cutting disks, sharpening disks and polishing disks. Bosch angle grinders represent some of the best on the market today and offer the quality you're used to getting from the Bosch company.