roller set outside diameter

例句：

1. 1. The roller set is used to rollthe paper into sheets.
   滚轮组用于将纸张卷成纸卷。
2. 2. The engineer designeda roller set that could handle heavy loads.
   工程师设计了一种能够承受重载的滚轮组。
3. 3. The roller set was installed inthe factory's production line.
   滚轮组安装在工厂生产线上。