The addition of XL Joinery Door Linings really do add a special and craft like finish to any room within your home. XL's internal Oak is A-Grade American White Oak Veneer and also FSC Certified. The lining kits are designed to work alongside our door collection and other door accessories helping to add a sense of consistent harmony to any property. With options you can select from 108mm and 133mm depths, but also covering internal French door pairs too. The section size is 22mm thick.