1.True planetary design extends gear head and motor life also reduces noise and increases transmission efficiency. 2.NEMA mounting standards for quick installation. 3.Quiet, under 8 arc-minute low backlash design, 5 arc-minute optional. 4.Precision gears made planetary mechanism to raise efficiency above 95%. 5.Integral gear ratio available from 3:1 through 1000:1 for wide range selection. 6.Two series of gear boxes with parallel and right angle body. each body have two type gear heads with r...