Maze is correct. The 'classes' attribute uses numeric values, not names.
You can even go as far as limiting to item type in case you wanted to reduce 1H items less than say 2H.
http://www.eqemulator.net/wiki/wikka...temIDReference
Code:
UPDATE items SET delay = delay * .80 WHERE (classes = 4 || classes = 16 || classes = 20) AND (itemtype = 0 || itemtype = 2);
This would reduce the delay of both 1H Slash and 1H Blunt weapons that are only useable by only Paladins, only Shadowknights and both Paladins and Shadowknights. You can modify this using the numeric values from both the wiki page Maze linked and the itemtypes page found above.
I hope this is helpful and you achieve what you're looking for.