Features 1、Excellent Red Copper: This round flat washer is made of excellent quality red copper, which has good ductility and proper softness for better sealing. 2、Annealing Heat Treatment Process: This round flat gasket adopts annealing heat treatment process to increase the ductility of copper, reduce its hardness, and appropriate softness to make the copper gasket sealing stronger. 3、Pickling And Purification Treatment: This round flat gasket adopts pickling and purification treatment to form a passivation film on the copper surface. After pickling and passivation treatment, the erosion resistance of this copper shim can be increased more than 10 times than other copper washers. 4、Wide Application: This round flat gasket is widely used for electrical connections such as household and commercial appliances, automotive and marine, fuel, hydraulic fittings, etc. 5、Different Sizes: This round flat washer set consists of 24 different sizes, which can meet your various needs, you can choose to use it according to your needs. Specification Item Type: Red Copper Washer Material: Red Copper Package List 20 x Red Copper Washer M5 x 9 x 1 20 x Red Copper Washer M6 x 10 x 1 20 x Red Copper Washer M6 x 12 x 1 20 x Red Copper Washer M8 x 12 x 1 20 x Red Copper Washer M8 x 14 x 1 20 x Red Copper Washer M10 x 14 x 1 20 x Red Copper Washer M10 x 16 x 1 20 x Red Copper Washer M12 x 16 x 1 20 x Red Copper Washer M10 x 18 x 1 20 x Red Copper Washer M12 x 18 x 1 20 x Red Copper Washer M14 x 18 x 1 20 x Red Copper Washer M14 x 20 x 1 13 x Red Copper Washer M8 x 14 x 1.5 13 x Red Copper Washer M10 x 14 x 1.5 13 x Red Copper Washer M12 x 16 x 1.5 13 x Red Copper Washer M12 x 18 x 1.5 13 x Red Copper Washer M14 x 18 x 1.5 13 x Red Copper Washer M14 x 20 x 1.5 13 x Red Copper Washer M16 x 20 x 1.5 13 x Red Copper Washer M16 x 22 x 1.5 13 x Red Copper Washer M18 x 22 x 1.5 13 x Red Copper Washer M20 x 26 x 1.5 13 x Red Copper Washer M22 x 28 x 1.5 13 x Red Copper Washer M22 x 30 x 1.5 1 x Tweezer 1 x Plastic Box