Built exclusively for Wild Bird Habitat from 7/8 inch Inland Cedar, assembled with zinc plated deck screws. Has a 1.2 inch opening that will allow chickadees and house wrens to gain entrance but keep house sparrows out. The front of the box opens for easy maintanence and annual cleaning. Has good ventilation and drainage. The nesting box includes sawdust, mounting hardware, installation and nesting data sheet. 13″H x 6.5″D x 5.5″W / Weight: 3.75 lbs.