The 3 tread Sherpamatic is the range topping fixed height 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) 1.91. Open Height (m) 1.91 Rungs/Treads 3 Material Aluminium. Usage Type Heavy Duty. Warranty 5-Year. Standard PIRL NFP 93353 & PIR NFP 93352. Platform Height (m) 0.72. Open Depth (m) 1.17. Weight (kg) 19