Steam Armor and Drill?

[AgentTBC]

I'm in Mehgard and two items for sale are a "Steam Armor" and "Drill".

The armor gives +30% to attack and +30% to defense with -1 speed but has a "special influence" on short humanoids which I assume means dwarves and alchemists and cannoneers and such. The drill gives +25% to physical damage with -1 initiative and has a "special influence" on melee warriors.

Does anyone know what this special influence is? I've equipped them and didn't notice anything unduly interesting. Maybe a hidden influence in combat?