Spiked knuckles

An improved version of the classic Brass Knuckles. The Spiked Knuckles do more damage, tearing into the flesh of your opponent in unarmed combat.

Fallout 3
In Fallout 3 the Spiked Knuckles are an Unarmed Weapon and are affected by the Iron Fist Perk.

Locations
It is possible to find a pair of spiked knuckles in a locker in Springvale School.