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The HMD34 has a powerful motor with two speed gearbox, Interchangeable gears for up to four speed. Minimal maintenance requirements. Large 5/8"- 3-1/16" (16mm - 77mm) 4" (100mm) Depth of Cut Capacity. Positive slug ejection. Uses Hougen "12,000-Series" Annular Cutters. Powerful high torque Hougen motor and gears, Four speed gearbox - 70/120/200/332 RPM. Integrated motor/gearbox design with guide rails for a rigid compact design. Pilot light for low light conditions and greater hole accuracy, Two stage magnet. Engages full power only when motor is turned on which increases magnet life. More holding power with impactor points.