This site contains affiliate links for which we may be compensated.
M5 PE Plastic Flat Insulating Washers Spacers Fastener 300pcs$9.98
Used for motherboard to prevent electrical short from metal to metal contact. Washers are normally used to distribute loads of threaded bolts, screws and nuts evenly as the fastener is tightened. Intended for the general use under the head of a bolt or nut in order to provide a smooth-bearing surface.