Precision-ground corrosion-resistant stainless steel Berkley 8 Electric Fillet-Knife Replacement Knife Blades are serrated, making filleting fish easier. They fit all Berkley electric knives and most other standard-size electric knives. It only takes seconds to replace old blades. Wt: 2.4 oz. Blade length: 8. Type: Fillet Knives & Combos.