Hook bunk ladder, 66 inches, 1 inch opening. * High strength 6063-T6 aluminum alloy, supports up to 300 pounds. * No external fasteners visible. Beautiful, finished appearance. No screw heads, etc. * Anodized satin finish on rails and steps. * Steps are padded to prevent slipping, providing a warm, cushioned feel. * Simple rugged construction. * All parts finished to avoid snagging clothing, and eliminate any physical danger of cutting or scratching. * 60" & 66" ladder lengths are standard. * No slip, no mar bumper pads on bottom of the ladder rails.