From cubicdissection.com:
Slideways by Ray Stanton and Akio Yamamoto is one of our favorite Interlocking Burrs. Three simple, identical pieces combine to form the symmetrical shape. The solution is trickier than it seems, and some struggle even after even seeing it performed in front of them. There is a tricky concept in play that must be understood; once discovered, the pieces' smooth movement is addicting. Slideways is not the most challenging puzzle, but it just may become your favorite.