Bentwings, I was recently looking for a wall chart of drill and tap sizes and equivalents and almost ordered one on eBay, but then discovered that the big Starrett wall chart, as well as the pocket card size version, are available FREE directly from Starrett. I ordered the wall chart and it showed up, totally free, in just a couple of days. You need to go to the Starrett site go to the "catalogs" link, then down the page to "order literature (US/Canada), and then make an account and then go to "conversion charts" and order your wall chart. Other free stuff is under the "Educational" link too. I haven't gotten any email from Starrett after making an account except one confirming my order. By the way, there are people selling the same wall chart on Amazon or eBay for $15--the exact chart you can get free.
I'm not sure if these charts are available outside of the US or Canada.