Designed by Ami Drach and Dov Ganchrow, each tool is specially engineered to fit the piece of stone or flint its paired with. Digital scans taken of the flint stones let each handle account for its blade's subtlest nook and cranny, resulting in some stylish hatchets and daggers cavemen could only dream of, if that.
The tools were put on display at the recent Budapest Design Week in Hungary. No Neanderthals were around to comment, but you can imagine what they might have said: something along the lines of "oogh!" More here.