产品规格：

63/50              20/90                  355/200              500/355
75/50              200/110              355/225              500/400
75/63              200/140              355/250              500/450
90/50              200/160              155/315              560/315
90/63              250/90                400/200              560/355
90/75              250/110              400/225              560/400
110/50            150/140              400/250              560/450
110/63            150/160              400/315              560/500
110/75            250/200              400/355              630/315
110/90            250/225              450/200              630/355
140/75            315/110              450/225              630/400
140/90            315/125              450/250              630/450
140/110          315/140              450/315              630/500
160/75            315/160              450/355              630/560
160/90            315/200              450/400
160/110          315/250              500/250
160/140          355/160              500/315?