The 500-1 series are one-section round rung straight ladders with a duty rating of 375 pounds.
The 500-1 series are one-section round rung straight ladders with a duty rating of 375 pounds. The exclusive ALFLO rung joint means TWIST-PROOF performance every time. The side rails are extra heavy duty I-beam rails and the aluminum round rungs are deeply serrated for slip resistance. The duty rating goes to 300 pounds with the 18', 20' and 24' lengths.