SEAC Unisex 0550017520000a Seac Hammer Diving Knife for Apnea and Scuba Diving Dagger with Straps, Black, One Size UK

I was impressed with this knife. It comes with its own sheath that has a button release for safety. It has rubber straps to attach to your arm or leg. I don’t use this for diving so can’t comment on but it does have a weight at the bottom of the handle. I use this for kayaking where I use an anchor so keep it close just for safety. The blade is sharp and decent quality.

Bought this as a friend also had one and it seemed a good piece of kit. Knife has a good heft and is sharp enough for everyday use. Fits into sheath with a positive click and is secure even upside down. Easy to release when needed. Straps are a bit fiddly to adjust but seem sound. Plastic clips seem ok and I have them strapped around the steering column on a boat. As a diving knife I don't expect any issues with water/salt and unlike some safety knives which have leather sheaths the only maintenance this seems to need is a quick rinse in fresh water (I'm a bit over cautions so I also wipe down the blade with an oily cloth after rinsing). So far have been very happy with it.

This knife is made from 420 stainless steel from my findings. I really like it and it is cheap. I struggle to sharpen stainless steel knifes in all honesty. I have tried many ways. Next I am buying a diamond stone basic machine that clamps the knife in place and runs the diamond stone along the edge at any given angle. I will go for 20 degrees probably. 420 stainless . This below is copied and pasted 420 stainless steel is harder, more wear-resistant, and heat-treatable, making it ideal for knives and tools, while 304 stainless steel offers superior corrosion resistance, weldability, and is non-magnetic, making it suitable for food-grade applications and medical equipment. The main difference is their intended use: 420 prioritizes strength and sharpness, while 304 prioritizes durability in corrosive environments.

⭐️⭐️⭐️ – Decent Knife, Poor Holster The knife itself is solid — sharp enough for basic diving or utility tasks and seems to hold up well underwater. However, the included holster is a letdown. It feels flimsy and doesn’t secure the knife properly, which makes it unreliable during actual use. If you’re planning to use this regularly, you might want to consider getting a better sheath separately. Decent value overall, but let down by poor retention.

The photos provided don't do the knife justice. I , tbh was only expecting it to have a short time use probably breaking or just not been particularly tough as the photos have an almost "toy" or "replica" impression making me think it'd be good for a few camping and/or hiking trips then a new one bought next year plus when you buy such items they are usually smaller than expected. But it was not the case I was chuffed when I got it. It's strong, sharp, robust aswell as being asthetically pleasing . It seems a knife that looked after, will last indefinitely. it's also great as a tool for hiking, camping etc with its holster/solid sheath and straps allowing you to carry it on hip, lower or upper leg or even strapped to your forearm. Looking forward to using it over the coming months for camping, hiking etc

Well the knife is well made, super sharp and leg strap fits on a 5mm wetsuit. I have 2 observations. 1 - Rusts super easily, as in you need to wash it immediately with fresh water after use. Also if you live next to the sea like I do, the air will rust your knife in days. You have to spray it with silicon spray to protect it if you live near the sea. 2 - Locking Mechanism is not great - If you need to crawl across rock or coral to get in an out of the water the knife locking mechanism can be unlocked very easily if it catches on the rock and releases the blade. I lost it twice in this scenario and fortunately recovered it. The locking mechanism needs serious improvement.

The knife its self is sturdy, very sharp, and an all round OK product. However... The sheath is plastic'y; feels weak and has a pathetic clip mechanism to hold the knife in. So much so that the knife slipped out and was lost at sea on its maiden dive. Fairwell my dear friend... DO NOT RECOMMEND.

All good, as described