材质 
M14
2
23.36
12.8
12.10
21
20.67
M16
2
26.75
14.8
14.10
24
23.67
M20
2.5
32.95
18
16.90
30
29.16
M24
3
39.55
21.5
20.20
36
35
M27
3
45.2
23.8
22.50
41
40
M30
3.5
50.85
25.6
24.30
46
45
M33
3.5
55.37
28.7
27.40
50
49