JCs Wildlife Barn Owl Nesting Box Large House Crafted in USA w The Barn Owl box is manufactured in the USA by JCS Wildlife. Great for rodent control. Outside is treated with Linseed oil to protect wood from elements. Wood is exterior grade plywood and is ready for outdoor exposure. The entrance hole is elliptical measuring 3 and 4 1/2" with 4 grip grooves below to aid in owl entry Come pre-assembled and includes drain holes in the bottom and holes under the roof overhang allowing for air circulation A hanging strip on the backside of the box allows for easy installation (recommended placement is 12'-20' high) ). Dimensions: on box are 23 " long, 12 " wide, and 16 " tall (roof overhangs box by 2 in front).