Rugged, Load-Tested*, All- Steel Construction. 100% Domestic Materials and Manufacturing. Large 3/4? Diameter for Strength & Safety – beware inferior 5/8? diameter steps. Meet or Exceed ASTM A394 Spec. for Tower Bolts. Charpy Impact Tested & Knurled for Slip-Resistance. Ladder frame provides a secure anchor point for lineman’s lanyards, and high-strength design even allows rigging directly from the ladder frame.