Slotting chisel set for upper making by Ernst Raub Präzisionswerkzeuge GmbH. This company was specialized in tools and measuring gauges for shoemaking. Closed in 1997 due to collapse in demand.
The chisels are used to punch slots in paper pattern or upper leather. The set goes from 1,0 mm till 13,0 mm.
If you have any questions or special needs, please ask.