Dotco Tools Vertical Grinders 3060 4060 Series bsp; 3060 Series Powerful, governed motor Ideally suited for the most rugged enviornments Maximum material removal in an ergonomic package 4060 Series Maximum material removal in any appliion Powerful motor delivering ultimate torque Model Spindle Size Free Speed (RPM) Abrasive Capacity (Grinder 1) Weight (lbs) Air Inlet Size (in) .