The Chillon is ideal if you are looking for a large crevice-style bat box that can accommodate small colonies. The capacity of this particular box is 35 mm deep.
 
Key Features:
Woodstone box: insulated and maintains an even temperature
Painted black: holds the heat
Wooden backplate for attachment
85 mm long textured landing board
Textured interior to aid bat movement
20 mm entrance slot 
 
Specifications:
Height: 462mm
Width: 315mm
Depth:  90mm
Weight: 4.9Kg
Material -  Woodstone
 
Description
This bat box can accommodate up to 15 common pipistrelle bats which are very sociable mammals and prefer to live in colonies.
There are textured landing area and interior for extra grip.