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Wire Conversion Chart

Gauge  inches   mm  drill bit
10  0.1019 2.586 38
12 0.0808 2.050 46
14 0.0641 1.626 51
16 0.0508 1.289 54
18 0.0403 1.022 56
19 0.0359 0.910
20 0.0320 0.811 65
22 0.0253 0.643 70
24 0.0201 0.510 74
26 0.0159 0.404
28 0.0126 0.320


Ring Size Chart

Number Sizes Inside Inside Inside Inside
US/Canada Diameter Diameter Circumference Circumference
Standard (inches) (mm) (inches) (mm)
5 0.618 15.7 1.941 49.3
5 1/2 0.634 16.1 1.991 50.6
6 0.65 16.5 2.041 51.8
6 1/2 0.666 16.9 2.091 53.1
7 0.682 17.3 2.141 54.4
7 1/2 0.698 17.7 2.192 55.7
8 0.714 18.1 2.242 56.9
8 1/2 0.73 18.5 2.292 58.2
9 0.746 18.9 2.342 59.5
9 1/2 0.762 19.4 2.393 60.8
10 0.778 19.8 2.443 62.1
10 1/2 0.794 20.2 2.493 63.3
11 0.81 20.6 2.543 64.6
11 1/2 0.826 21 2.594 65.9
12 0.842 21.4 2.644 67.2
12 1/2 0.858 21.8 2.694 68.4



Jump Ring Size Chart

Gauge OD MM ID MM Gauge OD MM ID MM

20g

4

2.376

19g

4

2.176

20g

4.5

2.876

19g

4.5

2.676

20g

5

3.376

19g

5

3.176

20g

5.5

3.876

19g

5.5

3.676

20g

6

4.376

19g

6

4.176

20g

6.5

4.876

19g

6.5

4.676

20g

7

5.376

19g

7

5.176

20g

7.5

5.876

19g

7.5

5.676

20g

8

6.376

19g

8

6.176

 

 

 

18g

4

1.952

18g

4.5

2.452

18g

5

2.952

17g

5

2.702

18g

5.5

3.452

17g

5.5

3.202

18g

6

3.952

17g

6

3.702

18g

6.5

4.452

17g

6.5

4.202

18g

7

4.952

17g

7

4.702

18g

7.5

5.452

17g

7.5

5.202

18g

8

5.952

17g

8

5.702

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