Rapala RSB4 Fillet Knife
- Length: 4 inches
- Size: 4 inches
- Material: Stainless Steel
- Pieces: 1
Last refreshed Aug 4, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A short stainless fillet knife for smaller catches, with a sheath included for storage.
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ASIN: B003CTYCFAModel: RSB4Category: Fillet Knives
Overview
Rapala's RSB4 is a 4 inch fillet knife in stainless steel, sold with a sheath for storage. Rapala is a long established fishing brand, and this length sits at the shorter end of their fillet knife range, suited to panfish and smaller catches rather than large fish.
A 4 inch blade puts this knife in the panfish and trout category rather than the longer 6 to 9 inch blades used for salmon or larger saltwater species. The included sheath covers blade storage and basic transport safety.
- 4 inch stainless steel blade
- Sheath included
- 1 count
- Rapala brand
Who it's for
Anglers who clean panfish, trout, or other smaller freshwater catches and want a compact blade that fits in a tackle bag. Not sized for filleting large saltwater fish.
Pros and cons
- Includes a sheath for storage and transport
- Stainless steel resists corrosion
- Compact 4 inch size for smaller catches
- Blade may be short for larger fish
Performance notes
Stainless steel resists rust in wet conditions, and the sheath protects both the edge and the angler when the knife is packed away.
Specifications
| Brand | Rapala |
|---|---|
| Model | RSB4 |
| Dimensions & fit | |
| Length | 4 incheslower than 93% of 45 fillet knives |
| Size | 4 incheslower than 92% of 54 fillet knives |
| Construction & materials | |
| Material | Stainless Steel |
| Color | Multi |
| Included components | |
| Pieces | 1 |
| Other details | |
| Special | Sheath |
Closest rivals on specs
Opinel Effile Slimline Folding Fillet Knife No.08- Length 4 vs 7.1 inches (-44%)
- Size 4 vs 3.5 inches (+14%)
OUTDOOR EDGE Fish and Bone Folding Fillet Knife- Length 4 vs 11.3 inches (-65%)
- Size 4 vs 5 inches (-20%)
Frequently asked questions
What size fish is the Rapala RSB4 fillet knife best suited for?
Its 4 inch blade suits panfish and trout sized catches rather than large fish that need a longer blade.
Does the RSB4 come with a sheath?
Yes, a sheath is included for blade storage.
What material is the blade?
Stainless steel.