Invite a bird home. Easy to build with included nails. Then paint or stain it. One-inch entrance hole. Includes precut wood pieces- dowel- sandpaper and instructions. 7in Wide x 7in High x 7.5in Long. Wolf Achievement 5d &5e Wolf Elective 13f; Bear Achievement5b; Webelos Craftsman Pin #2. Wooden parts have pilot holes for nails. We feel that glue just takes too long to dry so all our kits use nails. Also children need to have the opportunity to learn to use hammers and nails as a life skill. WARNING: Choking Hazard Small Parts and Sharp Points.