What Tool Do I Need to Loosen This Bolt?

Hello, I was just wondering what tool do I need to loosen this bolt - https://imgur.com/a/0iZlYsd? I tried a wrench but the wooden frame is in the way.

Comments

    • I Googled "Semi-circular metallic washer" first try and plenty of results. Could be named semi-circular metallic nut too.

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