1. Loose-proof device installed between frame and sash by stainless steel rope, when sash is divorced from the frame, the device can avoid the sash from falling down.
2. No differ left and right, easy and accurated installation.
3. The high strength stainless steel rope can bear more than 2500N tension force.
4. Good appearance, product seriation. Wide application for without groove, standard European C groove, single side European C groove and etc.
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