The Ah 15 is ideal for pipe drilling machines applicable in the gas and water network maintenance, and other rotary devices like irrigation canal shutters, rail road device lifts, reductor and spindle rotation etc. It features designs for rotation in two senses, a twist type triple positioning (clockwise, counter clockwise and neutral) control handle, independent and easy speed regulation in both rotation modes, and spring return handle ensuring complete safety. It eliminates fatigue thus increase productivity, has long operative life with minimal maintenance and can work in explosive environment yet completely safe.