Nylon washer. Used to protect surface against scratching or short-circuit (on electronic boards) by the bolt, and to increase the surface of the bolt pressure. Technical data Inside diameter: 3.2mm Outer diameter: 7mm Thickness: 0.5mm https://elecena.pl/product/22620567/10-pcs-m3x7mm-nylon-washer 2023-02-22 https://elecena.pl/product/22620567/10-pcs-m3x7mm-nylon-washer 2025-10-29