25mm Inner Dia Copper Washers Flat Sealing Gasket Rings Universal Car 20 PCS by | Jul 22, 2026Size: 25 x 32 x 1mm/0.98″x 1.26″x 0.04″ ( Inner Dia Outer Dia Thickness). 20 x Copper Washers. It is very useful to fix and seal machine parts by these copper rings. Color: Copper Tone. Material: Copper.