17mm to 13mm Non-Marring Socket Insert

thingiverse

This is an insert designed specifically for use with an 18mm socket. The other end is shaped to accommodate a 13mm body bolt that has been coated with paint, making it slightly larger in diameter compared to a standard 13mm socket. As a result, when inserted into a non-painted 13mm bolt head, the fit will be loose, but it will provide a snug fit on painted bolts. I've personally utilized this insert and can attest that it effectively completes the task at hand while saving money, as opposed to opting for the more expensive Snap-On alternative.