SuperKnife 503 SK2 Folding Utility Knife, Blue. When the Super Knife's blade is dulled, it can be easily removed and replaced with a new, sharp blade. Super Knife will accept a wide-range of utility knife blades and the one-piece blade holder design insures the blade will not slip out under pressure. Holds standard and contractor grade utility blades. Patented blade changing system that requires NO TOOL. Blue anodized aluminum handles with stainless pocket clip. Lanyard hole. Made in Taiwan.