The Problue KN-51 420 Stainless Steel Sharp Tip Knife is a titanium dive knife from Problue – corrosion-proof, lightweight, and razor-sharp. Titanium holds its edge far longer than steel in salt water, making it a smart long-term investment for regular divers at Perhentian Kecil’s secluded bays.
Technical Specifications
| Specification | Details |
| Brand | Problue |
| Product | KN-51 420 Stainless Steel Sharp Tip Knife |
| Material | Titanium |
| Blade | Sharp tip |
| Sheath | Included |
| Mount | Leg / Calf mount |
| Best For | Line cutting / Emergency |
Key Features
- Titanium blade: Corrosion-proof – never rusts, never needs oiling.
- Lightweight: You’ll barely notice it’s there.
- Long-lasting edge: Titanium holds its sharpness far longer than steel in salt water.
- Lifetime investment: Buy it once, use it for decades.
Suited for Malaysian Dive Sites
The Problue KN-51 420 Stainless Steel Sharp Tip Knife is built to perform across Malaysia’s best underwater destinations. Whether you’re exploring Perhentian Kecil’s secluded bays, 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 – titanium is corrosion-proof but salt still dulls the edge.
- No oiling needed – that’s the point of titanium.
- Sharpen less often than steel – titanium holds its edge.
- Store in the sheath.
Final Verdict
Buy it once, use it forever. The Problue KN-51 420 Stainless Steel Sharp Tip Knife is the long-term, corrosion-proof choice for divers who dive regularly.




Pamela Yeow –
Does the Plastic sheath and rubber leg straps provide enough protection for the knife when stored? I’m a bit concerned about durability.
Junhao Lo –
Thank you for sharing your concerns, Pamela. Yes, our Problue KN-51 420 Stainless Steel Sharp Tip Knife comes with a high-quality plastic sheath that provides excellent protection for the blade when stored. The rubber leg straps are also designed to keep the sheath securely attached to your leg, providing an additional layer of protection. We’ve had many customerswho have used these knives for extended periods without any issues with the sheath or straps.
Alicia Wong –
I was a bit hesitant to purchase this knife due to its affordable price, but I’m surprised by its quality. The 420 stainless steel blade is indeed sharp and the handle is comfortable to hold. However, I wish it came with a carrying pouch instead of the plastic sheath.
Leona Lai –
Is it safe to use this knife in wet conditions? I’m worried about rusting and would like to know more about the stainless steel’s water resistance.
Imran Hanafiah –
Thank you for reaching out to us about the safety of using the Problue KN-51 420 Stainless Steel Sharp Tip Knife in wet conditions. The blade of this knife is indeed made of 420 stainless steel, which is known for its rust-resistant properties. Although it’s not entirely immune to rust, the stainless steel used in this knife is generally suitable for everyday use and handling. However, as with any tool, it’s essential to maintain proper care and storage to prevent any potential rust spots. The high-quality plastic sheath provided with the knife helps to keep the blade dry and protected when not in use. To further minimize the risk of rust, we recommend wiping the blade clean and drying it thoroughly after exposing it to moisture. If you have any further questions or concerns, please don’t hesitate to ask.
Emily Tan –
Overall, I’m very pleased with the Problue KN-51 420 Stainless Steel Sharp Tip Knife. The compact design and quick-release mechanism make it perfect for camping and backpacking. However, I do wish it came with a more durable sheath.
Cecilia Goh –
What are the ergonomic details of the handle that make it comfortable to hold? I’m particularly interested in the material and design features that contribute to its feel?
Junhao Lo –
Thank you for your question, Cecilia. Our Problue KN-51 420 Stainless Steel Sharp Tip Knife features a compact quick-release handle made of high-quality materials for a secure grip. The ergonomic design of the handle allows for a comfortable hold, even in wet conditions. The materials used are durable and resistant to wear and tear, ensuring a long-lasting comfortable feel. The one-hand release makes it easy to operate the knife. Please note that we do not have a detailed breakdown of the material used in the handle, but we do guarantee that it meets our high-quality standards.
Kassandra Foo –
I’m extremely satisfied with the Problue KN-51 420 Stainless Steel Sharp Tip Knife. The blade is incredibly sharp and the ergonomic handle makes it a breeze to hold and use for extended periods. I love the compact design and the quick-release mechanism is a game-changer.