The MILWAUKEE M12 FUEL 1/4" Straight Die Grinder is designed to replace pneumatic die grinders. The die grinder provides users with up to.3 HP performance to outperform pneumatic die grinders by 20%. The M12 inline die grinder features 3-Mode RPM control and a responsive variable-speed trigger providing users with unmatched control with their most common accessories. The cordless die grinder gives users greater access and mobility, eliminating the frustrations of hoses and compressors.