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40° Key Ring / key ring

40° Key Ring
40° Key Ring

We use our fingernails to open the old key rings which would do harm to our fingernails. And it is not easy to use. This new key ring with a 40 degree angle is very convenient for us to open the key ring easily. Most keys can through the key ring directly.

Inside diameter: 30mm
Outer diameter: 38mm
Angle: 40°
Single layer thickness: 0.8mm
The opening size: 2.8mm


Huaqiao University

Huaqiao University
Xiamen, Fujian Province, China

Sijia Chen,
Huaqiao University

Xiaodan Yang,
Huaqiao University

Huangyu Fu,
Huaqiao University