The pinnacle 40m triple extension ladder is suitable for heavy industrial applications and are easier to store and transport than their double section counterpart the thick wall box section stiles incorporate rung locks to ensure they do not separate whilst the comfortable 39d39 shaped rungs help reduce fatigue and increase working speed closed height m 4 rungstreads 15 sections 3 material aluminium usage type heavy duty warranty 5 year standard bs 2037 class 1 weight kg 38