For your consideration, here is an Old Pair of ECKO Safe Edge Can and Bottle Openers, can piercer type, metal.  They measure 4 ¼ inches long.  They have a little wear on them.  One has a little corrosion on it. 

They will be mailed in a box for protection.  Item pictured is the actual item up for sale and comes from a non-smoking household.  (672.11b25b-.5kx1)