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WiseAutoTools.com Summary: We cover few ways to determine the size of a bolt. This is needed to select the correct size thread bolt repair kit. Different size kits have different size tooling, so they are not interchangeable. We also debunk the common mistake of using the head of the bolt to determine the size of the bolt threads. A very common mistake. The simplest way to determine the size is to go to a parts store and use their thread size sample display (AKA identifier or gauge) or use …