... lower influence of circumstance, non-deforming, exquisite appearance etc. Roller Blinds System Clutch: 38mm Aluminum Tube Fabric: ( 1%,3%,5%,10% ... ( Width30mm * Thickness:8-10mm):Chain roller blinds are consisted by the components of chute, clutch, chain, code, bottom rail, fabric ... spring help system could release the clutch’s load, to make the chain roller blinds system more durable; the pulling up ...