Symantec Tools is a newer variant that sprang forth from the older Symantec Utilities for Macintosh (SUM). I have version 1.1 of SUM. Symantec Tools is part of Disk Clinic (which I also have a copy of). You can read a little about it here:

http://books.google.co.jp/books?id=4D4EAAAAMBAJ&pg=PA28&lpg=PA28&dq=%22Symantec+Tools%22+%22disk+clinic%22+Macintosh&source=bl&ots=uAxjuSsYTc&sig=eyn9HkG4OlnYB9GAVjBWktA2log&hl=en&sa=X&ei=yUtIT-CdBebJmQXg_5CbDg&redir_esc=y#v=onepage&q=%22Symantec%20Tools%22%20%22disk%20clinic%22%20Macintosh&f=false

And this is about SUM II (which I unfortunately do not have a copy of) and the new (at the time) NUM 2.0:

http://www.greenstone.org/greenstone3/nzdl;jsessionid=63B13065877ACF8BBAE0B35325490128?a=d&book=off&c=tidbits&d=HASH01f97598667865312d925cba.6&dt=hierarchy&p.a=b&p.sa=&p.s=ClassifierBrowse