The Problue 420 Stainless Steel Diving Knife is a dive knife from Problue – stainless steel, sharp, and built to cut through fishing line, kelp, or anything else that might tangle you underwater. A safety essential for every diver at Langkawi’s pristine blue waters.
Technical Specifications
| Specification | Details |
| Brand | Problue |
| Product | 420 Stainless Steel Diving Knife |
| Material | Stainless steel |
| Blade | Sharp tip |
| Sheath | Included |
| Mount | Leg / Calf mount |
| Best For | Line cutting / Emergency |
Key Features
- Sharp cutting edge: Slices through fishing line, kelp, and entanglements fast.
- Stainless steel blade: Corrosion resistant and holds its edge in salt water.
- Secure sheath: Included – keeps the blade safe and you safe.
- Leg-mount ready: Straps to your calf for easy access on every dive.
Suited for Malaysian Dive Sites
The Problue 420 Stainless Steel Diving Knife is built to perform across Malaysia’s best underwater destinations. Whether you’re exploring Langkawi’s pristine blue waters, or heading to new reefs and wrecks, this gear delivers the reliability and comfort you need on every dive.
Care & Maintenance
- Rinse after every dive – salt corrodes stainless steel.
- Oil the blade lightly with a food-safe oil if storing for a while.
- Keep it in the sheath when not in use – protects both you and the blade.
- Sharpen when it starts to dull.
Final Verdict
A dive knife is safety gear, not a tool. The Problue 420 Stainless Steel Diving Knife does its job – cuts what needs cutting, fast and reliably.





Li Ming –
I used it for camping and I really like the compact size of this diving knife. It’s suitable for both underwater and land use.
Wong Kai –
What are the available colors for this product?
Chen Li –
Can you ship worldwide?
Imran Hanafiah –
Thank you for your question, Chen Li. Yes, we do ship the Problue 420 Stainless Steel Diving Knife worldwide. Please note that shipping rates may vary depending on your location. We’ll be happy to provide a shipping quote for you once we process your order. If you’d like to proceed, please contact our customer service team.
Brian Koh –
I recommend this product to anyone who needs a reliable diving knife. Minor negative point: The sheath could be more secure.
Karen Kwok –
Can I use the Problue 420 as a utility knife for everyday use, or is it only suitable for diving?
Imran Hanafiah –
Thank you for reaching out, Karen. The Problue 420 Stainless Steel Diving Knife is designed primarily for diving purposes. However, with its sturdy 420 stainless steel blade and sharp tip, it can also be used as a utility knife for everyday tasks.
Please note that it does have serrations which might be useful for various tasks, but may not be ideal for cutting delicate materials. Additionally, the compact quick-release sheath is designed to be worn on a diving boot, so you may need to adjust your attachment method for everyday use.
If you’re considering using it as a utility knife, we recommend checking local laws and regulations regarding the use of diving knives in everyday life. We hope this information helps, and if you have any further questions, please don’t hesitate to ask.
Vivian Teo –
I’ve tried the Problue 420 and it’s really a great product. However, the price is a bit steep for my budget.
Lily Tan –
I’ve been using the Problue 420 for a while now and I’m really impressed with its durability and performance. The serrations on the blade are perfect for cutting through fishing nets and the line cutter is super handy. The only thing I’d like to see is a bit more variety in the designs.
Asher Wong –
I purchased this as a gift for my friend who is an avid scuba diver. He loves it!
Emily Wong –
I’m looking for a diving knife that can be easily attached to my wetsuit. Does the Problue 420 have any attachments for this?
Junhao Lo –
Thank you for reaching out to us! We’re glad you’re interested in the Problue 420 Stainless Steel Diving Knife. Yes, it comes with a quick-release sheath that features one-hand release and rubber leg straps. This sheath can be easily attached to your wetsuit, providing convenient access to the knife while diving. I’d recommend checking out our product images or product description for more details on the sheath.
Elicia Wong –
Is this knife suitable for beginners?
Junhao Lo –
Thank you for your question, Elicia! While our Problue 420 Stainless Steel Diving Knife is a great product, we would recommend it for intermediate or experienced divers who are familiar with diving knife safety and handling. For beginners, we would suggest starting with a training knife or a knife with a blunt tip to minimize the risk of injury. However, if you’re still interested in the Problue 420, we recommend careful handling and following proper safety protocols. Please let us know if you have any further questions!
Jasmine Chia –
I’ve been using the Problue 420 for a few months now and I’m really impressed with its quality and performance. The 420 stainless steel blade is incredibly sharp and holds its edge well. The compact quick-release sheath is also super convenient and the rubber leg straps make it easy to secure it to your leg. The only thing I’d like to see is a bit more variety in the color options, but other than that, I’m really happy with this knife.
Samantha Lee –
Does this product come in a left-handed version?