Imperial Size

(Inches)

Metric Size

(mm)

1/4”

6.35

3/8”

9.52

1/2”

12.7

5/8”

15.88

3/4”

19.05

7/8”

22.22

1-1/8”

28.58

1-3/8”

34.92

1-5/8”

41.28

2-1/8”

53.95