A rounded plastic spacer of a specific thickness can be used to space a specific quantity of components while providing adequate electrical insulation and maintaining electrical conductivity on a printed circuit board.
PR-040 Plastic Project Enclosure
OP-300 Operator Panel Mounted Enclosures
DM-003 Wallmount Enclosure
RM-202 19" Plastic Enclosures for Rack Cabinets 2U
OP-100 Operator Panel Mounted Enclosures
Rounded plastic standoffs YP-900
A-675 Pan head self tapping screw