[Product Size]Bee Hive Nuc Box Entrance Gates: Diameter: 2.67inch(6.8cm); Hole diameter: 0.94inch(2.4cm); Center screw hole diameter: 0.16inch(0.4cm). Cross flat head self-tapping mounting screws: 0.16inch(0.4cm) x 0.63inch(1.6cm). Perfect for your hive,Excellent workmanship, for your beekeeping work to provide assurance, beekeeper's good helper [Product Material]Made of high quality stainless steel material, strong, oxidation resistance and corrosion resistance, long service life. It is reusable for you. Performance is far better than plastic material [Multi-mode Adjustable Design]Fully open, queen exclusion, closed with ventilation and fully closed. Rotatable, so you can easily choose different channels. It's very useful professional beekeeping tool. It can better protects your hives and honey [Wide Use]These entrance gates can be used for nucs five frame boxes, Swarm box, nuc box and split box. Control the entrance of the hive, facilitate the timely flow of air inside, and effectively keep the temperature and humidity in the hive stable Colour:Silver Material:Stainless steel Package Contents: 12 x Bee Hive Box Entrance Gates Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.