A good "multifunction tool" for a PSK or EDC is a Pocket Survival Tool. i bought mine at IMS Plus for $3. Its functions include...Knife, Cap Opener, Can Opener, Saw Edge, 4 Position Wrench, 2 Position Wrench, Wing/Butterfly Nut Wrench,Ruler, Screwdriver, Directoin Ancillary Indicator, and Lanyard Hole <-- not a function, but its listed!! laugh