The Hammer Fist is a grip tool with three steel strike plates, all positioned at different angles for driving in a nail, and all with surface areas small enough to indicate to me that whenever your hand is beating like a hammer, your heart will be too. Because how many pounds until you end up just off enough that it's your un-Hammer-fisted flesh hitting the hardware instead?
And even if you manage to hit metal-to-metal every time, without missing once, won't there be some increasingly uncomfortable reverberation traveling from your strike point up into your bones with your hand so ergonomically integrated into the hammering process?
Hammer Fist creator Timothy Scott Stuart built his design around the olden days practice of hammering objects with a rock. Its name comes from the Hammer Fist Strike used in martial arts. In addition to hammering, the Hammer Fist has several other functions that make it, despite my ragging, a pretty cool multi-tool.
You can also use the 5" x 3-1/2" x 1-5/8" Hammer Fist as a non-marring mallet, 90-degree square, SAE and metric ruler, dual nail puller, bottle opener, and hex driver.