Features: 4pcs reversible stainless steel entrance reducer set offer double hole design for bees traffics control, ventilation, and mouse protecting in hives. Features adjustable slider mechanism for universals compatibility with Langstroth 8/10 frame hives and year round durability against extreme weather conditions. Essential for beekeepers managing apiaries requiring colony protecting from intruders while ensuring proper hives airflows maintenance. Optimizes hives safety during seasonal by preventing rodents invasions and regulating ventilation in spring flows or winter cluster phases. Engineered with rust resistant stainless steel construction, this multipurpose tool doubles as feeder compatible infrastructure for sustainable beekeeping operations. Specifications: Dimension: 38cm/14.96in Component:metal Package Includes: 4pcs Multifunctional stretch telescopic nest door note: 1.Please allow 1-2cm errors due to manual measurement, making sure that you will not mind before order. 2.Due to the differences between different monitors, the picture may not reflect the actual color.