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