Plastic Hive Base - Ruchet Hb 51 * 29 Product Content Flat type, front sliding recessed hinged pollen trap 8 mm shore height Anti varroa grilled hive base 30 cm / 20 cm flight board Air channeled pollen collection tray Pollen drying tray Winter shrinking apparatus Non-slip elastomer shoes Product Dimensions Length 51 cm Width 29 cm Height 7 cm Entrance Width 20 cm Male Bee Passage 1 cm