13.0 amp AC/DC, 8,000 RPM motor provides high power and speed for 7" grinding applications, high power-to-weight ratio for greater efficiency and reduced user fatigue, keyless adjustable guard provides tool-free guard adjustments, increasing productivity, rear handle design for greater comfort and control, external brush caps for easy servicing, sealed ball and roller bearings for extended motor life, spindle lock button allows for single-wrench bit changes. 5/8-11 spindle thread.