IBM Portable 5155 Screws

[Kurthamm]

I need to repair the power supply, but the cover has these weird screws. There is a post in the middle of the hole.

Can someone tell me what kind of screwdriver I need to buy?

Thanks, Kurt

 

[Stone]

https://www.amazon.com/ATK67-Point-Security-Screwdriver-Handle/dp/B00BFINNJQ

 

[Kurthamm]

Thank you!!!