The large bat box is a chamber with a dome top and bigger void, similar in volume to Schwegler 2FN. Suitable for larger bats and colonies. 16mm hole for endoscope inspection in the base facilitating inspection, potentially avoiding working at height with the right equipment. Light internal finish facilitates detection of droppings or rub marks. Top loop makes initial attachment to the tree easier – with two further attachment points for 6” nails for security.