The Fox 599 Folding Karambit has been tested in extreme climates and is the highest quality available today. The Emerson Wave feature allows for fast deployment. Knife also features retention ring to provide a more sure and secure grip. Manufactured with highest quality NC690Co stainless steel providing a fine and consistent edge and corrosion resistance Please note that this model is for users who wear SMALL to MEDIUM sized gloves. If you wear, LARGE to XXL sized gloves, then please purchase the Fox 479 Karambit, which will be a better fit. The tension of the blade can be loosened or tightened using a torx 8 screwdriver.