8 tread GRP Glass Fibre Trade Swingback step ladders, every electrician should have a set of. Ideal for short duration work, in a spark risk environment. The combination of super-strong C-section glass fibre stiles and reinforced aluminium treads gives you a step that's electrically insulated to 35,000 volts . A durable yet lightweight and easy to handle step. Closed Height (m) 2.05. Open Height (m) 2 Rungs/Treads 8 Material Glass Fibre. Usage Type Heavy Duty. Warranty 5-Year. Standard EN131. Open Depth (m) 1.42. Weight (kg) 10