1. Installation check Reaming Bit, whether the connector is abnormal, and whether the size meets the requirements for use, and promptly take measures to deal with the Reaming Bit that cannot meet the requirements for use, and strictly prohibit the use if the requirements are still not met after the measures are taken.
　　2. For Reaming Bit that requires critical use, select feasible protective measures during installation.
　　3. Protect the surface rigidity of the Reaming Bit connector. It is strictly forbidden to blindly polish the connector without measurement to destroy its surface hardness.
4. During installation, check again whether the joint is complete and the pin hole is smooth, especially whether the piercing pin is intact, the pin head is swollen, and the piercing pin with burrs is strictly prohibited. The hammer piercing pin must be isolated with rigid and soft materials. It is recommended Use a copper rod to hammer and install.

5. For the disassembly type, it is strictly forbidden to use materials with greater rigidity than the piercing pin to strike the piercing pin. To detach the Extension Drilling Tools, a symmetrical strike is required. At the same time, the symmetrical strike is the best. Hidden damage caused by Extension Drilling Tools and frame.
　　6. ​​Spare Extension Drilling Tools must be rust-proof. For Extension Drilling Tools stored for a long time, they must be stored 180° rolling every week to prevent losses caused by natural bending.
7. For the Extension Drilling Tools pins that are difficult to disassemble, the first choice is to grind holes with a small grinding wheel, drill holes with electric drills for heating, hammer hammer hammering, symmetrical rotation strikes, etc. Secondly, use electric welding with pin puller to disassemble, etc. It is possible to protect the integrity of the male and female joints and ensure that they can be restored to the original use requirements.