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Traditional key ring concentrates all keys set together. While using, it is difficult to distinguish different types of keys. The classified key ring adopts the 8 character model, and divides the key ring into two equal size rings. It could store the keys effectively and in classification which is convenient to quickly find according to the classification while using. At the same time, while the classified key ring are interconnected with each other, it could form the classified ring exponentially. This could refine the categories of keys in more detail which is convenient and practical.