Vertebrae 35-40 mm (excl. quantum discount)

Swirls in size 35-40 mm for sealing the flight board. By putting the wing in the hive, above the flight board, this vertebra can stop the flight board when it is closed. By turning a quarter turn, the flight board can lower/open again and the bees can exit the hive. Note: Quantity discount from 10 pieces. Available in different lengths.