macmasterCar
brass 3mm rod
standard brass rod you want .114"
little trick
chuck your piece of rod in you drill (hand) , taper end slightly , dip in tapping fluid , and ( in low speed ) thread away to desired length and rev. drill
.125 rod is to big , It'll werk but tends to slip in the drill chuck .
3.0000 mm = 0.1181
1/8" =.125