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C-key is a key which has an opening on the hole of it. People used to collect the keys together with a key ring. However, we may find it difficult to fix the keys into or to take the keys out of the key ring.
The C-key can be used as a key as well as a key ring that can collect other keys together. As a result, the design can save materials. There is an opening on the hole of the key. Making use of ductility of the steel material and the simple structure, the user can easily attach keys to the C-key.
Yu Cao Jingwen Yu Lingyan Xie Xiaowei Li