The LS jaws are sold separately.
Here is how I use the jaws:
S-jaws:
Large side, "standard" case head, ie, stuff built off a .308 size case head.
Small side, stuff built off a .223 size case head
LS-Jaws:
Large side, Belted mags and WSMs
Small side, nothing I load for, maybe a 22 hornet?