knurl roll

例句：

1. 1. The metal was knurled to make it easier to grip.
   金属被螺纹处理以便于握持。
2. 2.The knurling on the handle is smooth and easy to use.
   手柄上的螺纹处理得光滑易用。
3. 3.This tool has a unique knurling pattern that makes it easy to hold and control.
   这把工具有独特的螺纹图案，使得握持和控制变得容易。