Versatile usage as leaning, extension and stepladder.Stairway mode possible (except size 3×12) .Adjustable stabiliser bar for uneven ground up to 120mm via easy to use foot pedal.Spirit level below middle section rung to achieve correct level.Rigid locking bar to prevent unintentional folding.High-strength restraining straps.Comfortable 30mm antislip rungs. Heavy duty bracketry and rung hooks/locks.Certified to EN131 Professional. 150kg safe working load. 5 year guarantee.