Angle grinders are some of the most versatile tools in a carpenter's arsenal. They're used to grind, polish, or cut metal and other materials. They're controlled by a trigger that opens and closes the angle grinder's cutting disc at high speedsâthe more pressure you apply to the trigger, the faster the cutting disc spins. Because they're so easy to control, they're ideal for delicate work like grinding down welds or polishing a piece of ironwork. Yet because they're so powerful, they can also be used for heavy duty tasks like cutting through rebar.Used for grinding, polishing, or cutting metal and other materials, the angle grinder is a useful tool that can be used to easily change the shape of metal surfaces. Angle grinders are also lightweight and easy to use, making them ideal for people who need to use a power tool frequently.