I need to know the name of the screws for a lenovo legion Y540

` I need to know the name of the screws for a lenovo legion Y540 » Motion design agency graphics studios

What are the screws name, so when i go to buy a screwdriver im sure it will match the screws on the back of my laptop?

PS: If a screw is rounded off, how do i get rid of it to open anyway?

Thanks!

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[fixed][/fixed]