This double-section ladder provides safe ergonomic service to the E&E compartment and difficult to access maintenance areas of the Boeing 757/767, 777, 787, MD 10/11 and Airbus A319, A320, A321 aircraft. LockNClimb ladders are built in the USA using 6061-grade aluminum support frames. They meet or exceed all applicable OSHA and ANSI standards and are rated 1A Special Duty ladders. They roll easily and are completely maneuverable by one person. They have a solid 25" wide base. Adjustment from 6 feet to 9 feet tall. Decreases risk of Fuselage damage.