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.
|Power armor model||Components needed||Perk needed||Added weight||Added value|
|Raider power armor||Blacksmith 1||3.0||50|
|T-45 power armor||Blacksmith 2||0.5||120|
|T-51 power armor||Blacksmith 2||0.5||140|
|T-60 power armor||Blacksmith 2||0.5||160|
|X-01 power armor||Blacksmith 2||0.5||180|