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The Entrance Block fits snugly in the opening between the bottom board and your first brood chamber to control the size of the entrance to the hive.
Approximate dimensions -
B.S. National Complete Hive Kit, Assembled, Pine, With Plastic Foundation
B.S. National Wood Bound Queen Excluder
B.S. National Wire Bound Queen Excluder
B.S. National Super, Flat, Cedar
B.S. National Plastic Queen Excluder