This HERCULES® 12V Brushless Cordless, 1/4 in. Right Angle Die Grinder has a high-performance brushless motor that delivers speeds up to 25,000 RPM to grind, sand, polish, and machine the toughest materials. The lightweight construction reduces user fatigue. The compact size makes this grinder easy to use in confined spaces. Powered by the HERCULES® Lithium-ion Battery System, this brushless grinder goes where the job takes it.