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This design just expending a hole can contain the key, that make the process of bunching keys easy. then towed to the entrance.The design of Easy Key Chain can solve that problem.As long as you can put the key into the space ,Are you still worring about how to put the key into the keyhole without using too much strength?
Ningbo Institute of Technology,
Ningbo ，Zhe Jiang, China
Ningbo Institute of Technology, Zhejiang University
Yuxiang GAO, Weizhen Zhan， Jianhua Chen