材质 
Φ32
32.9
32.5
6
20.5
Φ35
35.9
35.5
7
21.5
Φ38
38.9
38.5
7.5
23.5
Φ40
40.9
40.5
7.5
25.5
Φ45
45.9
45.5
8.5
28.5
Φ50
50.9
50.5
9.5
31.5