... non-deforming, exquisite appearance etc.Roller Blinds System1) Chain roller blinds are consisted by the components of chute, clutch, chain, code, bottom rail, fabric ... of anti-skidding and auto-lock in the operating process.4) The chain is smooth, little friction, against break.5) ... OKmax 10m2max 8kg---Middle &large,Height1. Using the helper spring, both of the applied area and the loading weight ...