Knife Straight

What is the name for a knife that pops up then down when you press a button?
I think it is called a New Yorker but when I search for new yorker knife on the internet I find nothing like that.
I'm not looking for a butterfly knife or one that opens from the side, I am looking for the one that pops straight up or down when you press or push the button
Can anyone please tell me what to search for or a web site I can go to to find this?
Its called a Stiletto and its illegal to own in most states.
xDestroy Babylonx - By The Knife
[affmage source="ebay" results="10"]Knife Straight[/affmage]

