Similar in construction to the "Big Frigger" power fist and others, the pneumatic power fist is a large metal glove, with a piston built in above the wearer's fist. The piston shoots forward with every punch, dealing more damage than most unarmed weapons. It no longer uses energy cells to operate.
The power fist can successfully strike about 500 times from full condition before breaking.
Fisto! - A more powerful version of the power fist, it deals the most raw damage of any unarmed weapon.
The Shocker - While equal in strength to the normal power fist against organic foes, The Shocker deals an additional 25 damage to robots.
Sim version Operation: Anchorage (add-on) - A sim-only version of the weapon which differs only in health (essentially non-degrading).
Two are on a small dock to the East of the Citadel, in the personal footlockers, which are locked with very hard locks. The key to the footlockers can be found next to an ammunition box in the nearby sunken boat.
If the player targets an enemy in V.A.T.S. that is below the players knees, the character will not punch, but kick the enemy. (although the sound of the power fist hitting the target is still present.) This can create some quite comical results.
On the side of the power fist, are carved in kill counts. 33 kills, to be exact.
If viewed in 3rd-person while equiped, there are two small exaust jets coming from the back of the power fist, indicating an internal engine of some sort.