This Konosuke Saya fits a number of popular 240mm gyutos. We asked Konosuke to not drill the hole for the saya pin to allow for variations in size for different knives so you can either leave it as is or drill it to fit. The knives that I've tried that fit are:
Devin Thomas ITK 240mm Gyuto
Hattori HD/ Maruyoshi HD Gyuto
Hiromoto 240mm Gyuto
Kikuichi TKC 240mm Gyuto
Konosuke 240mm HD, Stainless, White #2 Gyuto
Mac 9 1/2" Chef Knife
Masahiro 240mm Gyuto
Misono UX 10 240mm Gyuto
Moritaka 240mm Gyuto
Tojiro DP 240mm Gyuto
Tojiro ITK Shirogami 210mm Wa-Gyuto
Sakai Takayuki Grand Chef 240mm Wa-Gyuto
If you have a knife in mind that you want me to try please email and I'll see if it fits. The Richmond Addict and the Takeda Medium (240mm) Gyuto do NOT fit this saya.