A proven design with an unprecedented history of fire service, the Sutphen Ladder apparatus is constructed of aluminum alloy, and carries a 3:1 safety factor. Sutphen Ladder apparatus are designed to withstand extreme changes in weather, tremendous live and dead weights, and intense heat, too. And aircraft-type Huck Bolts mean there are no welds to crack. Bottom line, you can trust Sutphen to continue raising the height of ladder apparatus technology to ever greater levels.