The #HB-62 is the same blade used in the "Fiskekniv". It is just over 6", thin (just .067" at the base) and pretty flexible,
This one seems to be the most flexible Helle Blade in stock. Quite happy we were finally able to get the blade only version of this.
Sandvik 12C27 Stainless Steel
Length | 6.1 in / 155 MM