I'm not really sure what all the extra holes are for but they are 5/8" so they fit the keys. You could use them for odd angle mounting set ups I guess. That one milled flat beside the mounting flange slot has an alignment line for the optional swivel base zero mark. My Magnum vise has one too but of course it was a couple of degrees off zero.
I guess if all else fails I could read the owners manual. The reason for the round "sine keys" instead of square keys is so the vise can be mounted at odd angles and the sine key holes are 2 different sizes to work on metric or imperial size t-slots. Some are 5/8" (.625") and some are 16mm (.624"). This picture is from the owner manual.
The Kurt sine keys are square on the end that fits into the mill table t-slot. the ones in this pic are 5/8" round by 11/16" square and are $73 plus shipping!!
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