These nest box inserts are ideal to make your own rollaway nest boxes, they are constructed from durable plastic which is very easy to clean and will last for years. They are suitable for both large fowl and bantams. The fact the egg rolls away from the hen to a place where the hen cannot reach it is a great way of dealing with the problem of the hens eating their eggs. Also the eggs will stay cleaner. The external dimensions of the top is 340mm x 260mm.