If you have special requirements in aperture or other aspects, please inform our customer service in time so as to seek the best solution;

Pinion, rack and sprocket are all 45# steel, which will rust if touched by rain.The handwheel is made of cast iron and plated with chromium. In contact with air, the surface will lose luster.Above phenomenon, all belong to normal, will not affect the use

Drawings and samples can be customized processing.