Brass knuckles for your knuckle. Focus all the force of the knucks into a single finger, and marvel at your unstoppable power as you ascend into your planar form.
Really cool ring, I added some studs around to make it even more deadly. It's light, solid, with a variety of metals to choose from. I recommend glossy bronze if you like it rough, or gold-plated brass if bling is your thing (these are the two materials shown in the pictures).