There is plenty of filleting knives on the market but not many tick all the boxes like a Kewshaw Clearwater with a 9 inch blade and a sheath! 
 
The 9 inch Japanese stainless steel blade just gives you that little more length than the standard 7 inch fillet knife.
 
It's long and flexible enough to tackle almost every size of fish, handle shape and Co-Polymer material feels great and grippy in the hand and is easy to store with the sheath provided with out breaking the bank. 
 
If you only want 1 filleting knife then this is it! 
 
Knife Features
Blade length - 22.9cm (9")
Blade material - 420J2 
Blade Finish is Satin Finish
Blade thickness - 3mm
Total knife weight - 109g
Total weight with Sheath - 159g
Total length - 36.2cm (14.25")
Handle material - Co-polymer