The nest hole is 2.7cm. Please confirm before purchasing. * New, unused * Handmade from domestic cedar, with an opening on top, a clasp on the side, and holes in the bottom for drainage. * Designed to ensure a height of 15cm from the nest hole to allow birds to take flight for nest building and raising young. * The item in the images will be shipped. * The third image shows that anti-warping measures have been newly added to the inside of the top lid. * Dimensions: Width: Approximately 13-15cm, Depth: Approximately 21cm, Height: Approximately 26cm, Overall height (top to bottom): Approximately 36cm, Thickness: 1.2cm * There are two mounting holes on the top and bottom, on both the left and right sides. * Nest hole diameter: 2.7cm (Please consult if you have other requests) * No paint is applied to create a nest box that is in harmony with nature. * Important: This product uses natural cedar. We try to remove knots as much as possible, but occasionally knots may be present, and slight gaps may appear due to drying. Please understand this beforehand. * The material, not just cedar, tends to warp from the center (core) outwards. The construction takes this into account. The left and right sides will be opposite. It responds to nature and warps and returns. Please understand and purchase. #BirdSupplies #NestBox #BirdNestBox #GreatTitNestBox #WildBirdNestBox #GreatTit #BirdNestBox #BirdHouse