Angle grinders are the unsung heroes of the toolbox, providing a versatile tool for household and DIY tasks. They come in wheel diameters ranging from 4.5 to 9 inches, but professional wood and metal workers may prefer a larger, more versatile diameter. Power is measured in horsepower, amps, watts and rotations per minute. The best angle grinder should be a durable, versatile tool that gives you all the power it needs to perform basic tasks such as painting, carving wood, cutting metal, and cleaning metal. The price of an angle grractor varies depending on its size and whether it is cordless.