A:Answer Hi dtscoc! The screw size required to mount each Samsung TV can be found within the user manual. For the 58Q60T, you will need 4 M8 screws, 39-41mm length, 1.25mm pitch. Here is a link to the Samsung support page for model 58Q60T if you would like to reference the manual further: https://www.samsung.com/us/support/owners/product/qled-tv-q60t-2020
^Tim