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It is a redesign for the key. It has a hole which is asymmetric .so it will easy to take it right even in dark place. and what`s more, the edge of the hole has a groove which makes us to put the key into key ring easily. Use these two simple change makes the key more easy to use.
Bingzhi/Zhu Zhang/Cheng Ling`en/Wang Qichong/Wei