m3 slot - Motherboard form factor - Wikipedia wslot888 slot

Phillips pan head screws Freedriv with slot form H M3 x 3 - 761390.0210, ...

With two for the most notable ones being the R4 DS slot 1 solution and the M3 DS Simply. The widely used of the two it would appear is the M3 DS Simply.

Screws, Self Sealing, M3, 20 mm, Stainless Steel, Passivated, Slotted. Screws & Fasteners PEEK SOCKET HEAD SCREW M3 X 10. Essentra 183031070409. 183031070409 ...