440C Steel Rc. Kydex Sheath The White River Knives Traditional Fillet Fixed Blade Knife is an award winning fillet knife made for the serious angler. Both salt and fresh water fishermen report dozens of large fish can be filleted without ever touching up the blade. These professional quality knives are available in 6 or 8.5 inch blade length with ultra-light cork handles. Includes a Kydex sheath.