my clipper has color-coded comb attachments, and they go all the way from #1 to #15! interestingly, #15 is 1.5 inches and is colored black. i find that a bit racist, sorta like knowledge is king's posts.
p.s. i do a #4 on the sides (any lower and i get that really white scalpy look that asians are blessed with) and a #6 on the sides. i'm posting this here so i can go back on the internet to remember what comb size attachments to use.
p.p.s. knowledge is king.