Check the listing for details. Beehive Double Screen Board Snelgrove Screenboard for Langstroth Bee Hive. Color: Woodgrain, Condition: New. Listed at 29.98 USD. The BackyardFarm™ double screen board has many uses. Also known as a “Snelgrove”, the double screen board is a tool that no beekeeper should be without. Its multiple functions allow for efficiently and effectively performing the tasks of (a) requeening, (b) splitting/multiplying hives, (c) combining two hives into one, (d) strengthening an existing hive, (e) moving beehives in hot weather, (f) swarm control, (g) hive ventilation. The Snelgrove double screen board isolates the bees in the upper box from the bees in the lower box. The screen allows for heat to circulate freely while keeping the bees separate. There are top and bottom entrance doors located on 3 sides of the unit for maximum options and flexibility. Manipulating the six (6) built-in doors allows you to add or subtract bees from the top or bottom section with ease. Available in multiple sizes. -10-Frame size (model BFDSB-10) L 16.25” inches, W 1.25” inches, H 20” inches (41.28cm X 3.18cm X 50.8 cm.) -8-Frame size (model BFDSB-8) L 13.75” inches, W 1.25” inches, H 20” inches (34.92cm X 3.18cm X 50.8 cm.) Made in the USA . This product is proudly manufactured and assembled in the USA by BackyardFarm™ using quality pine wood & materials. Ships fully assembled. Ready to use right out of the box! No assembly required. It’s time to make your beekeeping experience more efficient & enjoyable! Add some double screen boards to your cart today. Thank you for saving the bees and contributing to the sustainability of our planet earth.