The 7-9 tread Sherpascopic work platform is the range topping adjustable work platform. The 250mm spaced and 80mm deep treads afford comfortable climbing- much like a traditional stepladder, but with the added safety features. Closed Height (m) 3.13. Open Height (m) 3.13 Rungs/Treads 9 Material Aluminium. Usage Type Heavy Duty. Warranty 5-Year. Standard NF PIR NFP 93 352. Platform Height (m) 1.76-2.22. Open Depth (m) 2.25. Weight (kg) 36