Point-to-point systems are suitable for hole-machining operations such as drilling, countersinking, counterboring, reaming,Boring, and tapping.

点位系统适用于钻、锪、扩、铰、、丝。

A locking device and a reverse counterboring tool bar are designed, their structure and working principle are introduced.

计了一种锁紧装置和一反锪刀杆，介绍了其结构原理。