... tube running and drive the fabric remove up and down. Chain roller blinds could build in spring helper ... Roller Blinds System 1) Chain roller blinds are consisted by the components of chute, clutch, chain, code, bottom rail, fabric ... little expensive, used in high and heavy blinds Chain Roller Blinds Schedule SystemOuter DiameterDense ChainThin ChainStainlessChainApplied AreaLoading weightHelper ...