--list-keys --with-colons

[Sascha Kiefer]

Hi,
if i run gpg.exe --list-keys --with-colons i get something like

tru::1:1106658621:0:3:1:5
pub:-:1024:17:B08719A2FF50BAD1:2005-01-20:::-:Sascha Kiefer (Test 2) <sak at dialogika.de>::scaESCA:
sub:-:2048:16:0A4DFB4128388F68:2005-01-20::::::e:

can you explain the different fields?
e.g. what does 17 (or 16) mean after the key size?

thanks in advance!
esskar