Windsor Twin Over Twin Bunk Bed By, Atlantic Furniture The Windsor boasts long arches and 3” corner posts. This elegant design is accented by solid hardwood construction featuring 26 steel reinforcement points. We certify this bunk bed model has been tested by an independent laboratory and is in compliance with ASTM F-1428 Standard Consumer Safety Specification for Bunk Beds and the Government Code of Federal Regulations 1213 and 1513