The Everbilt 36 in. Pocket Door Frame Set is designed for use with doors up to a maximum of 80 in. high and 1-3/4 in. thick. Its door panels are adjustable up to 5/8 in. vertically and the door rough opening should be 4 in. higher than the door panel height. The set features a slide-in nesting feature for easy installation and is adaptable to opening sizes up to 36 in.