Jack, no pics, but the BM website shows the models 580, 581 and 583 all have handle thickness of 0.650". This is fairly substantial. My BM 755 MPR has handle thickness of 0.610" and is called a bit of a "fat boy" by one reviewer, and that it'll make quite a bulge in the pocket. I frankly do not carry my 755 for this reason. I'm much happier with my Umnumzaan (0.465"), my ZT 0550 (.550"), my Spyderco Paramilitary 2 (0.450"), Military (0.550").
This will give you an idea at least. Some folks with larger hands prefer the thicker-handled models, but they do take up room in your pocket.
Sonny