Ring Blanks
| U.S. Size |
Metric Size (MM) |
Inside Diameter (MM) |
12ga |
14ga |
16ga |
18ga |
20ga |
22ga |
24ga |
| 1 |
39.0 |
12.4 |
45.5 |
44.0 |
43.0 |
42.1 |
41.5 |
40.8 |
40.5 |
| 1 1/4 |
39.6 |
12.6 |
46.2 |
44.6 |
43.6 |
42.7 |
42.1 |
41.5 |
41.1 |
| 1 1/2 |
40.2 |
12.8 |
46.8 |
45.2 |
44.3 |
43.3 |
42.7 |
42.1 |
41.8 |
| 1 3/4 |
40.8 |
13.0 |
47.4 |
45.8 |
44.9 |
44.0 |
43.3 |
42.7 |
42.4 |
| 2 |
41.5 |
13.2 |
48.0 |
46.5 |
45.5 |
44.6 |
44.0 |
43.3 |
43.0 |
| 2 1/4 |
42.1 |
13.4 |
48.7 |
47.1 |
46.2 |
45.2 |
44.6 |
44.0 |
43.6 |
| 2 1/2 |
42.7 |
13.6 |
49.3 |
47.7 |
46.8 |
45.8 |
45.2 |
44.6 |
44.3 |
| 2 3/4 |
43.4 |
13.8 |
49.9 |
48.4 |
47.4 |
46.5 |
45.8 |
45.2 |
44.9 |
| 3 |
44.0 |
14.0 |
50.6 |
49.0 |
48.0 |
47.1 |
46.5 |
45.8 |
45.5 |
| 3 1/4 |
44.6 |
14.2 |
51.2 |
49.6 |
48.7 |
47.7 |
47.1 |
46.5 |
46.2 |
| 3 1/2 |
45.2 |
14.4 |
51.8 |
50.2 |
49.3 |
48.4 |
47.7 |
47.1 |
46.8 |
| 3 3/4 |
45.9 |
14.6 |
52.4 |
50.9 |
49.9 |
49.0 |
48.4 |
47.7 |
47.4 |
| 4 |
46.5 |
14.8 |
53.1 |
51.5 |
50.6 |
49.6 |
49.0 |
48.3 |
48.0 |
| 4 1/4 |
47.1 |
15.0 |
53.7 |
52.1 |
51.2 |
50.2 |
49.6 |
49.0 |
48.7 |
| 4 1/2 |
47.8 |
15.2 |
54.3 |
52.8 |
51.8 |
50.9 |
50.2 |
49.6 |
49.3 |
| 4 3/4 |
48.4 |
15.4 |
55.0 |
53.4 |
52.4 |
51.5 |
50.9 |
50.2 |
49.9 |
| 5 |
49.0 |
15.6 |
55.6 |
54.0 |
53.1 |
52.1 |
51.5 |
50.9 |
50.6 |
| 5 1/4 |
49.6 |
15.8 |
56.2 |
54.6 |
53.7 |
52.8 |
52.1 |
51.5 |
51.2 |
| 5 1/2 |
50.3 |
16.0 |
56.8 |
55.3 |
54.3 |
53.4 |
52.7 |
52.1 |
51.8 |
| 5 3/4 |
50.9 |
16.2 |
57.5 |
55.9 |
55.0 |
54.0 |
53.4 |
52.8 |
52.4 |
| 6 |
51.5 |
16.4 |
58.1 |
56.5 |
55.6 |
54.6 |
54.0 |
53.4 |
53.1 |
| 6 1/4 |
52.2 |
16.6 |
58.7 |
57.1 |
56.2 |
55.3 |
54.6 |
54.0 |
53.7 |
| 6 1/2 |
52.8 |
16.8 |
59.3 |
57.8 |
56.8 |
55.9 |
55.3 |
54.6 |
54.3 |
| 6 3/4 |
53.4 |
17.0 |
60.0 |
58.4 |
57.5 |
56.5 |
55.9 |
55.3 |
55.0 |
| 7 |
54.0 |
17.2 |
60.6 |
59.0 |
58.1 |
57.1 |
56.5 |
55.9 |
55.6 |
| 7 1/4 |
54.7 |
17.4 |
61.2 |
59.7 |
58.7 |
57.8 |
57.1 |
56.5 |
56.2 |
| 7 1/2 |
55.3 |
17.6 |
61.9 |
60.3 |
59.3 |
58.4 |
57.8 |
57.1 |
56.8 |
| 7 3/4 |
55.9 |
17.8 |
62.5 |
60.9 |
60.0 |
59.0 |
58.4 |
57.8 |
57.5 |
| 8 |
56.6 |
18.0 |
63.1 |
61.5 |
60.6 |
59.7 |
59.0 |
58.4 |
58.1 |
| 8 1/4 |
57.2 |
18.2 |
63.7 |
62.2 |
61.2 |
60.3 |
59.7 |
59.0 |
58.7 |
| 8 1/2 |
57.8 |
18.4 |
64.4 |
62.8 |
61.9 |
60.9 |
60.3 |
59.7 |
59.3 |
| 8 3/4 |
58.4 |
18.6 |
65.0 |
63.4 |
62.5 |
61.5 |
60.9 |
60.3 |
60.0 |
| 9 |
59.1 |
18.8 |
65.6 |
64.1 |
63.1 |
62.2 |
61.5 |
60.9 |
60.0 |
| 9 1/4 |
59.7 |
19.0 |
66.3 |
64.7 |
63.7 |
62.8 |
62.2 |
61.5 |
61.2 |
| 9 1/2 |
60.3 |
19.2 |
66.9 |
65.3 |
64.4 |
63.4 |
62.8 |
62.2 |
61.9 |
| 9 3/4 |
60.9 |
19.4 |
67.5 |
65.9 |
65.0 |
64.1 |
63.4 |
62.8 |
62.5 |
| 10 |
61.6 |
19.6 |
68.1 |
66.6 |
65.6 |
64.7 |
64.1 |
63.4 |
63.1 |
| 10 1/4 |
62.2 |
19.8 |
68.8 |
67.2 |
66.3 |
65.3 |
64.7 |
64.1 |
63.7 |
| 10 1/2 |
62.8 |
20.0 |
69.4 |
67.8 |
66.9 |
65.9 |
65.3 |
64.7 |
64.4 |
| 10 3/4 |
63.5 |
20.2 |
70.0 |
68.5 |
67.5 |
66.6 |
65.9 |
65.3 |
65.0 |
| 11 |
64.1 |
20.4 |
70.7 |
69.1 |
68.1 |
67.2 |
66.6 |
65.9 |
65.6 |
| 11 1/4 |
64.7 |
20.6 |
71.3 |
69.7 |
68.8 |
67.8 |
67.2 |
66.6 |
66.3 |
| 11 1/2 |
65.3 |
20.8 |
71.9 |
70.3 |
69.4 |
68.5 |
67.8 |
67.2 |
66.9 |
| 11 3/4 |
66.0 |
21.0 |
72.5 |
71.0 |
70.0 |
69.1 |
68.5 |
67.8 |
67.5 |
| 12 |
66.6 |
21.2 |
73.2 |
71.6 |
70.7 |
69.7 |
69.1 |
68.5 |
68.1 |
| 12 1/4 |
67.2 |
21.4 |
73.8 |
72.2 |
71.3 |
70.3 |
69.7 |
69.1 |
68.8 |
| 12 1/2 |
67.9 |
21.6 |
74.4 |
72.8 |
71.9 |
71.0 |
70.3 |
69.7 |
69.4 |
| 12 3/4 |
68.5 |
21.8 |
75.0 |
73.5 |
72.5 |
71.6 |
71.0 |
70.3 |
70.0 |
| 13 |
69.1 |
22.0 |
75.7 |
74.1 |
73.2 |
72.2 |
71.6 |
71.0 |
70.7 |
