I don't know what it is, but people who install Cat oil filters like to overtighten them so a regular filter wrench won't remove them. I have an Oreilly retractable breaker that I attach a filter wrench to and it's a dream team to remove the filter. Nothing will stop me The size really helps too, because sometimes you REALLY have to hold on to it, and those with the smaller group size just don't look like they're putting up a fight. Better than the filter key I bought from Snap On.
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