Insinuate puzzle

This is a brand new two piece interlocking cube puzzle which is my adaption of a design by Bram Cohen. It's an interesting challenge to insinuate the spiral piece into the loopy piece using a sequence of 7 moves (including slides and rotations) until they take the shape of a 4x4x4 cube. A great little puzzle to keep in your pocket and show to puzzlers and non-puzzlers alike.
This puzzle is one of the few that works really successfully when printed in metal.