The 4 Frame Nuc entrance reducer is made from anodised aluminium and is designed to segregate/isolate the entrances of each colony. It also provides a location guide to secure the divider board in the correct position. The entrance reducer is used with the 9 Frame Hive 4 Frame Nuc Divider board. These can be purchased together as a conversion kit.
Together, the entrance reducer and divider board fits snugly to the underside of the hive body lid, ends and across the hive floor eliminating any possibility for bees to pass between hives.