CONTROLLER FILLET KNIVES Make short work of messy business. The Controller Fillet Knife System is designed for clean, smooth cuts with a flexible blade that provides just the right amount of give. The intuitive GuideFins™ & tactile HydroTread Grip™ offer ultimate control of the knife, even in slippery conditions. All three sizes available: 6”, 8” & 10”. Sheath w/ integrated sharpener included.