Features:

The guide rails and lead screws are increasingly important in recent years. Among all solulions. the roll up covers has the following advantages: convenient, low-cost, small volume and long travel. They are more noiseless and smooth in the operation comoared with telescopic covers.

Advantages: conve nient, tow- cos t, small volume noiseless operation and high speed.

(The equipped spring traction mechanical devices promise 500,000 cycles.)