The Universal Sani-Nest may be used in the cage as any standard nest box would be or may be installed in the cage floor as a permanent, subterranean nest. This nest box measures 18" long by 10" wide by 8" tall. The nest box is constructed from 1/2x1 16ga. galv. before weld wire. Top edges are bent smooth for safe entry/exit of the box while protecting the edges of the card board liner (one liner is included).