For your consideration, here is a Wallet Ninja Metal Multi-Tool, used.  It is made to fit in a wallet card sleeve.  It measures 3 1/4 by 2 1/16 inches.  It has very little wear on it.  It will be mailed in a box for protection.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (605.949p.4bx1)