... Blinds System Clutch: 38mm Aluminum Tube Fabric: ( 1%,3%,5%,10% 15% Openness in polyester & Fiberglass)Bottom Rail ( Width30mm ... of chute, clutch, chain, code, bottom rail, fabric etc. The aluminum alloy tube is 28mm or ... oxidation treatment surface and smooth pvc plug-in unit. The fabric is no need to be sewed ... roller blinds is wide and high or the fabric is massive relatively, the spring help system ...