dimensional drawing of an m3 16mm bolt

I'm not even sure I should publish this because I can't really promise you that it's correct. I just wanted to take a stab at it since I couldn't find one here. From the documents I've found, M3 16mm bolts are roughly 3mm tall and 5.5mm diameter at the cap, and 16mm tall and 3mm diameter for the shaft. Do with this what you like.