Magnetic separation rack

Rack for purification using magnetic beads for use in molecular biology.
The magnets are 10mm dia x 5mm thick Ultra High Performance N52 Neodymium Magnet from Amazon, approx. 1$£€ each. They just snap into place no glue needed.
The rack is in two parts; a magnet holder and a tube holder (1.5ml only!). This allows the tubes to be put on and taken off the magnets at once, they can even be vortexed in the tube holder. There are 4 tube positions per rack but they are designed to link together, I've used 4 linked for a rack of 16.
There are other tube positions in the rack for simple sample transfer. The spacing of the rack is 14mm, compatible with many tube racks and some variable spacing multichannel pipettes. The angle of the rear of the rack is such that the rack and magnet holder can be flipped to rest on this face aiding the magnet.
This works far better than any commercially available rack, I wish I'd made it years ago.
For a video see Extremely Rapid and Specific Metabolic Lab