Iyoyo Impact Axle Size?

While investigating an issue with the bearing I dropped and lost the axle for my new iyoyo impact. I see that iyoyo sells replacements of various sizes on their website, but I’m not sure which size to get. Does anyone know what the right axle size for an impact is?

Its listed as a M4 x 8mm stainless, you could also drop a Sōchí 8mm titanium in there as well

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Awesome. That’s exactly what I needed. Thank you!