The Little Giant Queen Excluder prevents the queen from producing brood in the honey supers. Precisely measured holes allow the worker bees to move throughout the hive while preventing the queen from moving upward out of the brood box. Made of injection-molded plastic, the queen excluder is easy-to-clean and lies flat on the brood box. Precise hole size that prevents queen access to honey supers Fits 10-frame Langstroth Hive