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@Regal
The same size as the allen keys you use on them, i.e. probably some combination of 4 / 5 / 6mm depending on your exact stem / clamp / seatpost.
I have one superglued into my Nitto Pearl stem bolt but I also tried gluing one in the seat binder bolt and that bounced out from road vibration. I have Atomic 22 bolts in there and the saddle clamp now. Nice but pricey.