One hand plastic queen bee catcher and marking cage combination. Use for catching and holding queen bees while you mark them.
You simply open the grid door, make sure the plunger is away from the door, place the unit over the queen, and slowly close the door to trap the queen.
Then gently push the sponged plunger to the grid to hold the queen in position while you mark her. The slots on the grid are a size that allow any worker bees to escape.
Once mark is dry, slowly loosen the plunger, then open the grid door to let the queen out.