Manufactured from american white oak veneer, onto a timber core our oak linings are suitable for all door sizes up to 838mm. These lining sets are designed to be used on door leaves from 21" ( 533mm ), 24" ( 610mm ), 27" ( 686mm ), 30" ( 762mm ) and 33" ( 838mm ). This universal design makes it easy for you to select and order internal oak door frames to suit all your needs from one stock code. Great stability, and with a engineered softwood timber core, rather than MDF these solid wood internal door frames are ideal for fixing into your structural opening. Loose door stops also provided.