Rolls
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 |