10 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 thats electrically insulated to 35 000 volts a durable yet lightweight and easy to handle step closed height m 255 open height m 25 rungstreads 10 material glass fibre usage type heavy duty warranty 5 year standard en131