/diy/ - Do It Yourself

Can someone help me figure out what size bolt are in these mallet heads?

Calipers say on both
>7.50mm or 0.295in
>7.75mm or 3.05in

And the thread pitch gauges seems to fit both metric 1.25 and SAE 20

>bought a cheap soft faced mallet and really like is
>saw these replacement faces on ebay, $1.20 shipped from china
>show up and they dont fit, much smaller

I just got a lathe and figure a good project in the near future is to make hammer and throw these caps on, but Im not sure exactly what im doing. I assume its metric because its a chinese cap, but 7.5mm isnt a bolt, and thats pretty far away from both m7 and m8 isnt it?