Using a queen excluder can be a helpful way to stop the queen accessing the honey supers. The gaps in the excluder are sized to allow the worker bees through to the honey supers but not the larger sized queen. If the queen lays eggs in the honey supers it can be difficult to harvest clean honey. Benefits of Timber Rim Queen Excluders - the timber frame provides the recommended bee space when placed between boxes, allowing the bees to move freely above the frames, - the timber frame provides better insulation than standard queen excluders so less heat escapes from the excluder. 2 STANDARD SIZE AVAILABLE: 8 Frame Size - 19 7/8" (L) x 14" (W) 10 Frame Size - 19 7/8" (L) x 16 1/4" (W) PACKAGE QUANTITY OPTIONS: 1 pack or 5 pack