Rusty knuckles

The rusty knuckles are a power armor modification in Fallout 4.

Characteristics
The rusty knuckles modification attaches to the armor's arms and causes unarmed attacks to cause bleeding damage, slowly whittling down an enemy's health. Raider, T-45, T-51, T-60 and X-01 power armor can be fitted with rusty knuckles modification; it requires Rank 1 of Blacksmith to upgrade raider power armor, and Rank 2 of Blacksmith to upgrade the others.