palm air nailer
#1
#2

A palm nailer is still run on air, It is used for nailing in tight spaces where a full size gun or hammer can't access well.
More than a Carpenter
http://www.carpenter.cjb.net
More than a Carpenter
http://www.carpenter.cjb.net
#3

their is a cylinder that protrudes from the nailer itself that holds the nail. Once you put the cyclinder over the area to nail, apply pressure and it's rat-a-tat-tat and the nail is in. as far as durability goes, it's yet to be tested. i would also make sure you can completely set the nail on an angle (such as a toe-nail in framing). you're better off with a nail gun, unless you have arthritis or carpal-tunnel probs.