K60-43mm fixed deceleration clutch roller shutter assembly for roller shutter

K60-43mm Fixed Deceleration Clutch Roller Blinds Components, For Roller Blinds Roller Blinds Components, 1) Heavy duty, max 5/6/8/12/15KGS2)Noiseless & Smooth3)Metal Core, 4 springs4)Long-lift time, 10,000 times 

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