TURBO-SHARP X is an enclosed electrode grinder, which significantly reduces harmful radioactive (2%Thoriated) grinding dust exposure to both the user and the environment. Properly ground electrodes improve arc starting and stability, reduce tungsten shedding, increase electrode life and enhance welding consistency. New improved TURBO-SHARP X features adjustable head! - Grinding Discs Last 3 x LONGER!! 3 position adjustment. Each position allows for grinding on a different area of the grinding disc. Triples the lifetime of grinding disc.