Masamoto Sohonten Kiritsuke Shaped Sujihiki 255mm MV Stainless (MV4425S) with SAYA With Handle 2mm at the heel provide

2mm at the heel provide the necessary weight and strength for breaking apart whole fish and splitting smaller bones during filleting tasks

mm  Width of Spine at Middle of Blade

They call it Magnesia Bonding in comparison to their Resin bonding on the Naniwa Superstones

and a 1000/3000 grit flattening stone

Masamoto Sohonten Kiritsuke Shaped Sujihiki 255mm MV Stainless (MV4425S) with SAYA With Handle 2mm at the heel provideThe Masamoto MV Stainess Laser line, super thin and flexible knives in monosteel construction. Masamoto Sohonten, the undisputed king of Japanese kitchen knives, has arrived at Knives and Stones. Started by Minosuke Matsuzawa in 1872, succeed by Kichizo Hirano in 1891, Masamoto Sohonten is now under the management of the 6th generation Masamoto: Masahiro Hirano. With almost 150 years of history, Masamoto Sohonten is recognized by almost every Japanese