HLH Screened Bottom board is engineered and designed by beekeepers for beekeepers. Hands down the best on the market. 45 degree slanted front landing board integrated with the bottom board, solid constructed sides for long term use. Heavy gauge galvanized steel mesh for the screened center. Solid sliding bottom, gives you the added option of having a solid bottom board without having to move the hive. Usage: Screened bottom boards are used to provide ventilation to the hive. Unlike other screened bottom boards on the market, ours have a sliding solid bottom that allows you to control the amount of ventilation that you need without having to disturb the hive. | Harvest Lane Honey Screen Bottom Board