Johnson Hardware 203068PF 36" x 80" Pocket Door Frame HEAVY DUTY - Designed to carry heavy solid core doors up to 400 lbs. and 1 3/8" to 1 3/4" thick ADJUSTABLE - Can also be cut down for use with smaller sized doors, adapted for block masonry walls SOLID MATERIALS - Galvanized steel wrapped Spruce, Pine or Fir VERSATILE - Can be adapted for use in non-standard wall thickness. MADE IN USA - Manufactured in the United States.