C-Clamps: 1/2" vs. M12 Yolk Bolts

I have several older ETC C-Clamps that have 1/2" yolk bolts, but Iooking around online, the ones I currently see for sale either don't specify the bolt size, or say they're M12.

It's not clear to me if ETC is manufacturing these in two different models for different markets,  or if they've updated all their c-clamps to M12.

Can someone offer me some insight on this?

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