... roller tube running and drive the fabric remove up and down. Chain roller blinds could build in ... appearance etc. Roller Blinds System Clutch: 38mm Aluminum Tube Fabric: ( 1%,3%,5%,10% 15% Openness in ... by the components of chute, clutch, chain, code, bottom rail, fabric etc. The aluminum alloy tube is ... Spring System When the chain roller blinds is wide and high or the fabric is massive relatively, the ...