This Louisville AL2540MG Aluminum framed atic ladder provides improved squareness and predrilled holes for ease of installation. Designed for attic opening of 25.5 In. x 54 In., fits ceiling heights from 7 Ft. 8 In. to 10 Ft. 3 In. Gas piston system alows easier and smooth opening and closing door. This attic ladder has a working load capacity of 375 Lb.