This is a Garka angle grinder. Angle grinders are versatile power tools used for cutting, grinding, and polishing various materials like metal, stone, and concrete. They are commonly used for tasks such as removing rust, shaping surfaces, and cutting through tough materials. The term "flex" is a colloquial name for angle grinders in some European countries, while in Russia they are known as "bolgarka". Features often include adjustable side handles for comfortable grip and safety features like spindle locks for easy disc changes.