材质 
M16
2
29.56
17.1
16.4
27
26.16
M20
2.5
37.29
20.7
19.4
34
33
M22
2.5
39.55
23.6
22.3
36
35
M24
3
45.2
24.2
22.9
41
40
M27
3
50.85
27.6
26.3
46
45
M30
3.5
55.37
30.7
29.1
50
49