Holds ¼ to 3/8, 3/8 to ¼, 3/8 to ½, ½, to 3/8, and ½ to ¾ socket adapters. Also holds ¼ drive, 3/8 drive, and ½ drive universal joints. There's a version for a 10x4mm magnet in each corner and one with a flat bottom.
The author remixed this model.