Axminster Slide & Load Utility Knife

The two most annoying problems with a utility knife are (a) trying to change a blade and (b) opening up the halves to find that there are no new blades there. The Slide & Load solves both these problems. When the blade becomes even remotely dull just push the slider fully forward, depress the red button and pull the offending blade out. The blade can either be reversed and reinserted or discarded. If a new blade is required, move the top slider all the way back and then forward again, a fresh blade will appear as if by magic. It's all done by magnets and springs actually. And there is storage for up to ten heavy-duty blades included in the handle magazine.