This oiled leather wallet holds a set of several different files from coarse to nearly smooth. A file set can be used to cut through manacles, bars, or locks. It typically takes 10 minutes to file through 1 inch of metal, or 1 minute to file through 1 inch of wood.[1a]
Source[]
1: Warhammer Fantasy RPG 2nd ED -- Old World Armoury
Warhammer Wiki