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• Product Description:Name: Ball BearingMaterial: 304 Stainless Steel/440 Stainless SteelSize:Inner Diameter * Outer Diameter * Thickness440 chrome steel material: After vacuum quenching and decarbonization treatment, the hardness can attain 58 degrees, appropriate to be used in weak acid alkali high load environments. Due to its excessive carbon content material and magnetic properties, the corrosion resistance isn't always as good as 304 stainless steel.304 stainless-steel material: with high nickel content material and coffee carbon content, the cloth has a gentle and difficult hardness of 25 degrees, which is not compatible for high load operation and is acceptable to be used in strong acid and alkali environments.The records is for reference only, please confer with the genuine object!Package Include:According in your Choose！

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