For what is PG M3 SLOT 1 ON MAINBOARD?

Spring Plunger Stainless Steel with Ball and Slot M3 to M24 Spring plungers are inset into a mechanical application to index, lock-out or position a moving

Item, T Slot Nut Size, M3

m3 slot 180-9113, RS PRO, RS PRO M3 T-Slot Nut Connecting Component, Strut Profile 30 mm, Groove Size 6mm, Brand RS Pro, Connector Type T-Slot Nut, Fits Groove Size

m358 slot The x3650 M3 provides four PCI Express x8 IO slots for increased network or storage connectivity Manageability and security Powerful systems