Grounding plates are typically made from conductive materials like copper, aluminum, or stainless steel, and come in various shapes such as round, square, and rectangular to provide stable grounding connections. Name: Grounding Washers Brand: PandaSolar Item: PD-GW Product Origin: Fujian, China Material: Stainless Steel Warranty: 12years Duration: 25years Shipping Port: XiaMen Port Lead Time: 7-15 days Standard:AS/NZS1170/JISC8955:2017.