
I have a port freight rate up to 17mm but recently had a project where I needed 18mm. It was cheap and worked great. I didn't really use it for its intended purpose. I had an 18mm bolt that was very tight but I couldn't get a full head in due to the gap. I had to use a short 18mm wrench on the bolt and then use this hex bit in a broken bar wrench to loosen the bolt. Worked great.

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