Product Features 99 1044/2057 : 1 Planetary Gearbox, High Torque 0.018° Step Angle Gearbox rated for sustained torque of 48 kg-cm NEMA-17 Bipolar 4-wire $45 not bad for this step angle. Solves the http://en.wikipedia.org/wiki/Polar_coordinate_system design's issues used in Rotational Art projects. http://www.eztronics.nl/webshop2/catalog/Robotics?product_id=225 50 Euro
