General description Copper sealing washers are essential components for ensuring leak-proof seals in various applications. This pack contains 100 pieces of high-quality copper sealing washers, designed to provide reliable sealing performance in plumbing, automotive, and other mechanical applications. Technical specifications Inner Diameter (ID): 12mm Outer Diameter (OD): 16mm Thickness: 1.5mm Standard: DIN 7603A Quantity: 100 pieces