Interior Oak Doors with 6 panel colonial design. Available in 6' 8" heights as single prehung doors or prehung double doors with ballcatches or optional astragal with flushbolts. 6 panel interior prehung doors includes: stain grade solid wood door jambs, hinges and bore. Oak Bifold doors for use as interior closet doors or utility doors compliment our interior Oak doors precisely and include all hanging track hardware.