Built exclusively for Wild Bird Habitat from 7/8 inch Inland Cedar with a 1.5 inch opening. Assembled with zinc plated deck screws. The front of the box opens for easy maintanence and annual cleaning. Built in ventilation and drainage. The nesting box includes sawdust, mounting hardware, installation and nesting data sheet. 13″H x 6.5″W x 5.5″W / Weight: 3.75 lbs.