The Finest Interior Poplar Doors in 2 Panel or 4 Panel Flat Shaker panel Design. Available in 6' 8" and 8' 0" heights x 1 3/4" thick, sold as slab, single prehung doors or prehung double doors with ball catches or optional locking astragal with flushbolts. Poplar shaker panel interior prehung doors includes: pre-primed interior door jambs, hinges and bore prep (optional Poplar Jambs Available.)