In my case on my Valor they were metric, M6 - 1.0.
To find out the size of your grease fittings Morryde says if a 5/16 socket fits over the zerk then it is 1/4-28 SAE and if a 5/16 does not fit then it is M6-1.0. The M6 fittings use a 7mm.
When I have time, I am just going to turn the bolts around so I can grease them without taking tires off or adding 45 or 90 fittings. They should have come from the factory facing inward.