The knife is particularly useful and convenient. However, after the first dip, once it was cleaned with fresh water, the knife started to show rust stains in the areas visible in the photo. The product description may say Stainless Steel 420, but the blade does not have the characteristic engraving as is customary for blades of this type. Therefore, when cleaning it with plenty of fresh water, a descaling cleaner is required. However, if you are going for a dive in a remote place, obviously the last thing you will have with you is a descaling cleaner. If you expect to return and clean it, the damage has already been done. I would not recommend it to anyone.