Help Identifying a Part

[Great-Kazoo]

I've got 2 things I need help identifying.

The first is a Craftsman tool my father in law had but I have no idea what it is or what it's supposed to be used for. It's about 4" long.
Attachment 69727

The second is something (tool?) I found in the back of my Durango I got for my son a few years ago. I believe it's a tool as well, but for what? (Tape measure in pic to give an idea of size)
Attachment 69728

The craftsman is a nut cracker
http://www.sears.com/craftsman-nut-c...wH8w&gclsrc=ds



Second one is for Medical Oxygen cylinder

http://mar-jmedical.com/oxygen-cylin...C1E16DB5F9F60E