Swivel symmetrical clip for double-sided grinding without reinstalling of knife. Clamp structure allows to clamp rigidly and symmetricaly knives with complex blade geometry. It is perfectly suitable for hunting and folding with wide spine. Narrow spine knives are not recommended to be sharpen using single clamp as it can be bent. Recommended knife lendth for the clamp: 50-200 mm. Minimal knife width 20 mm, spine thickness 5 mm, angle range 10-32 degrees (wide knife range can be different). Clamp sponges are made from aglow sprung-spring steel 65 g. It isn't suitable for K-01 model. Sponges, screws and flat springs can be bought separately.