A ball screw is a kind of transmission mechanical component in which a steel ball moves between screw and nut to convert the sliding contact of the traditional screw into rolling contact.

The discipline of tooling design is fundamental to manufacturing. The cost of manufacturing and of the end product depends heavily upon tool design.

Saw tool is a common hand tool, divided into hand saws and electric power saws, which facilitates our simple sawing needs. Among them, hand saws are divided into many different types, and suitable hand saw tools can be selected according to different needs.