The SD card holder is a project that i made so i could easily store my SD cards.
I used a laser to cut and details the wood .The magnet is a .25 x .0625 in magnet that go half way through the wood. The magnet also has a tight fit in the wood and does not come out. The case is made of three layers: the top is the cover; the middle is the holding frame; the final piece is the bottom.
Cyan: outside borders
Green: cut half way through the wood for the magnet
Red: fine details
Created for imperial measurements
..25 x .0625 inch magnets