BWG قطر
mm قطر
mm طول
18
1/245
18 - 25
17
1/473
25 - 30
16
1/651
30 - 40
15
1/829
14
2/108
40 - 50
13
2/413
50 - 65
12
2/769
11
3/048
10
3/404
50 - 75
9
3/759
8
4/191
75 - 100
7
4/572
100 - 125
6
5/156
125 - 150