Complete nesting block to open and and close.
Immediately usable nesting block with 63 loose wooden nesting boards and 360 neasting holes for up to 3600 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 from the coocons and is easily cleaned.
Diameter either 8mm or 9 mm, for both mason bee species.