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Here is a hand with different chain thicknesses to help you find the thickness you are looking for.
MM to Centimeters
1 mm = 0.1 Centimeter
2 mm = 0.2 Centimeter
3 mm = 0.3 Centimeter
4 mm = 0.4 Centimeter
5 mm = 0.5 Centimeter
6 mm = 0.6 Centimeter
7 mm = 0.7 Centimeter
8 mm = 0.8 Centimeter
9 mm = 0.9 Centimeter
10 mm = 1 Centimeter
Here is a picture of different chain lengths in inches to help you find what length your looking for.
Inches to Cm
16 inches = 40.64 cm
18 inches = 45.72 cm
20 inches = 50.8 cm
22 inches = 55.88 cm
24 inches = 60.96 cm
30 inches = 76.2 cm