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Everyday we carry our keys with us， however it's not so easy for us to put them into the key rings. Sometimes our nails will even get hurt during this process. In this design, the top will be replaced by a oblique cut, which will make it more convenient to put the keys into the ring without opening it. We can see that ingenious design will bring us easy life.
Haitao Dai Wei Shi Bin Bo Yonggang Meng