
Nice. The shank of these tiny wrenches is very small. H4 A little less than 4mm. My calipers said 3.97mm. A 4mm wrench fits loosely, but a 5/32" wrench fits perfectly. Finding a driver for the H4 wave seems to be difficult. Most commonly we have 1/4 inch in the US. However, I pair this with a 1/4" magnetic screwdriver handle and a 5/32" wrench and it stays together. If it falls apart on your track, it can be difficult to find a dropped small wrench. And those even smaller nuts or bolts too! Make sure you have a magnetic drive holding the pieces together.

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