Sliding case for compact storage for 10 pcs of 1/4" hex bits. For functionality you need 6 pcs of D10x3 magnets. With the magnets the bits are not falling out of the holes but you can still remove them with one finger. 

No supports needed even with poor bridging the hole have enough tolerance for the bits. Glueing the magnets are optional, for me the press-fit worked great.