Features:A good helper tool for the beekeeper. Safe and healthy. Easy to use.Simple to operate, high performing, and cost-effective.Made of stainless steel material, anti-rusty, safe and non-toxic.Install it on the beehive to make it easy for bees to go in and out.For timely flowing of the air in the beehive.Four access methods: fully open, queen excluded, closed ventilation and fully closed.Specification:Condition: 100% Brand NewColor: SliverMaterial: Stainless steelInlet disc diameter: 6.8 cm / 2.68 inch (appr.)Package Included:5 x Beehives Nest DoorNotice:Please allow 1-3cm error due to manual measurement and make sure you do not mind before ordering.Please understand that colors may exist chromatic aberration as the different placement of pictures.