For such an unimpressive looking set of 'tryout' keys, I am always amazed at how utterly useful the WP10 can be.  These picks are awesome when it comes to picking the old style wafer padlocks that were once so popular (and are still sold today).  Also, I've found they can be quite effective at picking other wafer style locks, like those found on jewelry boxes and some luggage.  This is the stainless steel version of the wafer lock pick set.  If you prefer the same 4 tools in spring steel, check out the PKS Wafer Lock Picks.