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It really doesn't matter. It works similar to a chuck in a drill press, the 3 parts on the inside have teeth on them. It slides over the stud, as you turn the nut on the back of the tool counter clock wise, it tightens onto the stud. A 3/8 ratchet fits into the nut on the back, the harder you turn to loosen the stud the tighter it grips the stud.
I ended up taking both studs out as the kit from colony has 2 new ones. I heated the first stud with a propane torch for about 30 seconds and it came right out. I removed the second stud with out any additional heat. I think it listed in millimeters because that seller is in the UK.
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