Alright so Im trying to learn about drill and tap sizes but the charts are kinda confusing. I need to drill and tap the tc support bolts. The size of tap for the stock.bolts is m10x1.5. The next size up in my kit is m12x1.75. Will this work to retap the holes? The size of the drill bit should be 13/32 according to the chart, correct? What size bolt is this?

Im more than kind of lost...