The 10B Nest Bowl is made entirely from Woodcrete, a durable blend of wood and concrete that is guaranteed to last for at least 25 years. It is designed to be installed inside an outbuilding such as a shed, stable or barn where there is constant access for birds through a door or window. As swallows are social nesters more than one bowl can be used in the same building, although they should be placed at least one metre apart. The distance between the top of the bowl and the ceiling should be a minimum of 6cm.
The design of the bowl means that it can be easily cleaned out in the autumn when the birds have departed. Cleaning is not absolutely necessary but is recommended if possible.