1, small size, light weight, reserved mounting holes, threaded holes and standard hole spacing, vertical installation, horizontal installation, flexible choice, but also can be used with our company's own production of integrating ball and light source, the overall versatility;

2, 20 (28) stepper motor and refined transmission structure, small air return, two-way precise limit;

3, excellent workmanship, durable;

4, continuous adjustable aperture;