The Maxi Advance small egg quadrant set is the perfect accessory to the Brinsea Maxi II Advance or Maxi 24 Advance egg incubators. This insert increases the egg capacity of the incubator to 40 pheasant or quail eggs giving you the flexibility to hatch more species. The 4 plastic egg quadrants simply clip together so you can incubate eggs of one size or mix and match different egg size quadrants and incubate eggs of different sizes at the same time.?