- The 717Series 4 tread platform stepladder is constructed using extremely durable, non conductive, seven-layer fibreglass rails that are highly resistant to weathering. A platform height of 0.93m enables a safe working height of 2.68m so this ladder is ideal for any job around the worksite. The 7170418 ladder features a multi-functional HolsterTop™ to keep tools organised and limit trips up and down the ladder and is ideal for working around electricity. Other features include slip-resistant steps for comfortable standing and EDGE bracing to help prevent rail damage. Approved to the latest EN131 standard. For Professional Use.