i'm not quite sure, but just do what i did if you can. i went to home depot and bought a set of allen keys in metric and american (the whole thing was $10-$12). one of them will fit. and this way you have (virtually) any size key you'll need for anything in the future.
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Originally Posted by SuperDuck
An ebay "sniper" program is one thing, getting a vasectomy via ebay is worthy of its own thread. ;)
Pretty much what Bob Clayton said. If you're going to invest in an allen key or two (Online, presumably?) you're better off just running to the store and buying a set. :]