Pressboard washer. Used to protect the 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: 0.7mm Material: pressboard https://elecena.pl/product/22620565/10-pcs-m3x7x0-7mm-insulating-pressboard-washer-brown 2023-02-22 https://elecena.pl/product/22620565/10-pcs-m3x7x0-7mm-insulating-pressboard-washer-brown 2025-10-29