I have a Lenovo Z510 bought several years ago. I finally decided to order a new RAM module to install.
I found this guide on Lenovo's website. The screw sizes I need to unscrew/screw are:
* M2 x 2.5mm (flat head, nylok coated)
* M2 x 4.9mm (flat head, nylok coated)
* M2.5 x 6mm (flat head, nylok coated)
I need to go out and buy screwdrivers for these sizes. What I am not able to understand is what the "M2" and "M2.5" are. It is unlikely the store in my locality would know about it either, so I would be tasked with simplifying it for him. How would I go about doing that?