These are 8mm standoffs/spacers with M2 threading.
M2 Spacer/Standoff - 5mm (Brass/Nickel) - StacksKB
Comes in a pack of 10 standoffs.
M2 Standoff Spacer Brass Round
HVAZI M2 Nylon Hex Male-Female Spacer Standoffs Screw Nut
M2 M3 Hex Male Female Brass Standoff Hexagon Threaded Stud Board
M2 Spacer/Standoff - 14mm (Brass/Nickel) - StacksKB
M2 Spacer/Standoff - 14mm (Brass/Nickel) - StacksKB
PATIKIL M2 M2.5 M3 M4 M5 Standoff Screws 50 Pack Brass Hex Spacers
M2 M3 Hex Male Female Brass Standoff Hexagon Threaded Stud Board
Gummy O-Ring - (50A, Silicone, for 60% keyboard) - StacksKB