Black powder coated with a spring clip plate
https://www.allbro.com.au/itemdetails/hardware/hinges/external-hinges/external-hinges-(5)/black-powder-coated-with-a-spring-clip-plate?code=410110%2fb&type=2&access=2&id=69d146d9-ecfc-4a5c-8783-b12875aea112
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