The 12 tread Industrial Swingback Step is constructed from heavy duty channel section stiles with riveted treads - this no nonsense aluminium platform step is a simple, yet reliable performer for daily use in harsh environments. Closed Height (m) 3.09. Open Height (m) 2.85 Rungs/Treads 12 Material Aluminium. Usage Type Heavy Duty. Warranty 5-Year. Standard BS 2037 Class 1. Platform Height (m) 2.93. Open Depth (m) 1.86. Weight (kg) 14