Pin (4e Equipment)
From D&D Wiki
 Pins and Needles
 Simple Melee Weapons
|Pins and Needles||+2||1||5-10||0 gp||0 lb.||Light Blade||Light Thrown|
Pins and Needles are household items turned weapons; they might be sharpened, but retain the shape of a small, sharp, metal cylinder. Any similar object will do just fine too, though, like nails or screws or even shards of glass. Basically, any small, sharp object. P.S.: if you think this should be moved to improvised weapons, feel free to do so.