This is a direct replacement for the Norton IM-313 sharpening system. It is a Hard Arkansas stone. Stone measures 11.5" x 2.5" x .5" in size.
Q. Is this Hard Arkansas stone made for the Norton IM-313 stone system?
A. Yes, it is a direct replacement for the Norton system.
Q. Is this made by Norton?
A. No, it is not made by Norton. It is made in Arkansas, USA.