If you regularly use a knife for #craft #3dprinting, #parcels .. whatever.. and always need a sharp blade you can pick up a #knife that holds a #60 #scalpel blade.
Just be sure to pick up the stainless steel blades (carbon steel is common).
Of course it goes without saying these are very, very sharp. The handle does not lock. Don't get one if you regularly cut yourself.
The size 60 blade are for autopsies.
I also have a size 23 handle, I picked up 100 blades for $15.
