Complete nesting block to open and and close.
Immediately usable nesting block with 22 loose wooden nesting boards and 120 nesting holes for up to 1200 breeding cells. The block has solid and impregnated walls and and an easy closing mechanism. Use just on dry spots, where it's protected from rain.
This robust and durable nesting sites offers an easy extraction of the coocons and is easily cleaned.
Diameter of the holes either 8 mm or 9 mm, for both mason bee species.