Gryphon Convertible Professional Stained Glass Grinder with Extras POWERFUL DC MOTOR - 0.67 amp, 3000 rpm. NEW AND IMPROVED - Built-in Electric Pump with spongeless cooling. LONGER BIT LIFE - Improved cooling allows bits to last longer. LARGE WORK SURFACE - 13.5" by 10.5" with a second story platform. INCLUDED - Two Gryphon bits and face shield.