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3
14
69
BS5
4
3.5
16
71
4
6
4.5
18
73
5
5.5
20
75
6
6.5
7
7.5
8
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8.5
22
77
BS5
6
9
9.5
10
10.5
24
79
11
11.5
26
81
12
12.5
13
13.5
14
14.5
15
8
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1/8"
14
69
BS5
4
3/16"
18
73
6
1/4"
20
75
5/16"
3/8"
22
77
1/2"
26
81
9/16"