MS yellow passivated tapped spring and L- pin
https://www.allbro.com.au/itemdetails/hardware/hinges/concealed-hinges/concealed-hinges-(1)/ms-yellow-passivated-tapped-spring-and-l----pin?code=1010122%2fspecial&type=2&access=2&id=eb48cbb1-ea10-4a7f-a2c7-cb439d14c497
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