If you're the type to carry extra steel, this may become your favorite Sparx accessory. A twist and a click and you're ready to sharpen your spare blades without the hassle of having to install them on your skate.
Pro Tip: Skate steel is in its straightest state when not mounted in the holder. If you're a stickler for even edges, try removing your blades from the holder and sharpening with the Sparx Blade holder.