Next is a very interesting fact and that is the metal-file used on SAKs. I will not talk so much about the different variations besides that the new stainless steel types used are a bit coarser. Never the
less they are much more versatile than just to be used on metal. It is mentioned that one side can be used as a nail-file and so on too. However the function: For people that have worked some on wood they know the use of files and sandpaper and the different
grit used. The metal-file on SAK can be used on different materials like wood and plastics as well. Actually on wood it is an excellent tool!
In the history people did not always have so many tools
to make a knife handle with. They used a simple homemade hand drill, a knife and some files.
I did learn for myself that it is fully possible to get a nice surface on a knife handle without sandpaper
or to use it before sanding.
The metal-files before the stainless steel were usually Case-hardening Steel and the surface was a bit better to be used on wood. Never the less I believe the new is
an improvement for the particular use on Swiss Army Knives. The Case Hardening types can cut metal and be used as a metal-saw because this is why it was made and be used to clean metal surfaces or the different tasks you need. Same with the new type.
It is not so that this function is just a gimmick. No! They are intended for use and made for this.
A metal-file surface can have coarser and a less
coarse surface and this you can take advantage of. The pressure you put on the wood surface can be adjusted very easy with you own hand. Light pressure will give a finer surface. In this sense you can with the pressure get a similar effect as the different
grits on a paper. I believe many today have forgotten the use of a file.