The size of chain of your existing blinds can be measured by counting the number of balls it has for a certain length, as well as the diameter of the balls.

  Ball Diameter Balls per Length
No. 10 Chain 4.5mm 17 Balls per 100mm
No. 8 Chain 3.9mm 20 Balls per 100mm
No. 6 Chain 3.2mm 25 Balls per 100mm
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