The Pinnacle 4.0m Triple Extension Ladder is suitable for heavy industrial applications & are easier to store & transport than their double-section counterpart. The thick wall, box section stiles incorporate rung locks to ensure they do not separate whilst the comfortable D shaped rungs help reduce fatigue & increase working speed. Closed Height (m) 4 Rungs/ Treads 15. Sections 3. Material Aluminium. Usage Type Heavy Duty. Warranty 5-Year. Standard BS 2037 Class 1. Weight (kg) 38