Transparent Unbreakable LEXAN flap 6-1/4 x 6-1/4 with 4-way lock. Interior or exterior use. Telescoping frame ranging from 1-1/4 to 1-3/4 in thickness. For cats 2 - 12 lbs. Flap size 6.25 x 6.25 Cutout size 7.5 x 7.25 Door thickness range 1.25 - 1.75