M5, M6, M8, M10, M12, M14, M16, M18, M20, M22, M24, M27, M30, M33, M36, M42, M48
Metric Pure Copper Flat Washers Plain Washers Fit for Bolts and Screws DIN 125 
High-quality materials, environmentally friendly,  safe and reliable, durable and long life. Excellent craftsmanship, Smooth without burrs, quick and simple use.
Note: 
Flat washers are stamped parts, and the measurement data will have tolerances.  The inner diameter is a positive tolerance, and the outer diameter is a negative tolerance.
Usually, what is the size of the bolt/screw, and the washer used in conjunction with the same inner diameter size. For example, M3 screw, use M3 washer (inner diameter 3mm).
● System of Measurement: Metric
Standard: DIN 125 (ISO 7089) (GB /T 97)
Material: Pure Copper ( Red Copper )
Size(mm) = Inner Diameter x Outer Diameter x Thickness
DataCaciques