Track bar relocation hole.

Been working on relocating my track bar. Drilled a few holes stepping up to the big one. But I can't find the right bit... What size do I need for the hole. Gonna have to run to the store to get it so any info would help. 3/8 to small 1/2 too big looking at a 7/16. Do you know if they make metric drill bits cause the bolt looks like a 10mm.

Any help is appreciated!

I believe I have used 7/16"[11mm] on the umpteen track bar brackets I've modified. They have metric bits, but why bother? Just use a thick washer on the front side of the bracket, tack weld it if you want, but it's not really neccesary

Thanks I borrowed a 7/16 from a neighbor a lil while after posting this cause i wanted to get it done. So now that you said get that I think I will work.