Our woodworker Josh made this saya to fit many of the knives that the Konosuke saya won't fit. It's taller and slightly longer to accommodate a wide variety of knives including. The slot opening is 58.5mm and the opening is 3.5mm wide and it tapers. The saya fits:
Super sweet saya! It fits my Richmond Artifex 240mm gyuto perfectly and the pin that holds the blade inside is a really nice touch. The wood on the saya comes sanded but unfinished,so don’t touch it with wet or oily hands or you’ll leave marks on it. I guess you could always stain/seal it so you don’t have to worry. Overall awesome saya!