These are 5mm standoffs/spacers with M2 threading.
Aexit 100Pcs M2 x 5mm Thread Knurled Brass Standoff Spacer for Mother Board : : Tools & Home Improvement
Litorange 320 Pieces M2 Male Female Hex Brass Spacer Standoff Screw Nut Threaded Pillar PCB Motherboard Assortment Kit : : Tools & Home Improvement
M2 Standoff Kit,180pcs Black M2 Male Female Standoffs Screws Nuts Assortment Kit with Box : : Tools & Home Improvement
M2 Standoff Kit,180pcs Black M2 Male Female Standoffs Screws Nuts Assortment Kit with Box : : Tools & Home Improvement
M5 Spacer/Standoff 25mm - StacksKB
Comes in a pack of 10 standoffs.
M2 Standoff Spacer Brass Round
M2 Spacer/Standoff - 5mm (Brass/Nickel) - StacksKB
Black Nylon Screw and Stand-off Set - M2.5 - 380 pieces
M2 X 20MM FEMALE BRASS HEX THREADED PILLAR STANDOFF SPACER - iFuture Technology
M2 5 Standoff
: Tools & Home Improvement
Litorange 320 Pieces M2 Male Female Hex Brass Spacer Standoff Screw Nut Threaded Pillar PCB Motherboard Assortment Kit