What Is It? Pneumatic Tool

[bbbentley]

A friend is offering his garage full of tools to me to purchase. I was curious what this is? He thought it was a stove pipe crimping tool? Thanks sYc. http://www.yenko.net/ubbthreads/pics/usergals/2015/09/full-13059-31673-nikon_1_570.jpg
http://www.yenko.net/ubbthreads/pics/usergals/2015/09/full-13059-31674-nikon_1_557.jpg

[marxjunk]

take a pic of the while thing..sometimes hard to figure out without seeing the whole thing...