About this 3D model

This is a mini tray with a magnet inside it. I'ts very useful to keep metal objects while working. I'm using a 20x2mm neodynium magnet. You can buy a 10 units pack here: http://www.dx.com/p/super-strong-rare-earth-re-magnets-20mm-x-2mm-10-pack-10305#.U5yZCPl_uSo