ZNB1091 Features: * Extension ladder * 200 lbs duty rating * Household use * 1-1/2"" traction tred is deeply serrated with flat steps * Slip-Resistant Traction-Tred D-Rungs * ABS red end caps and rail closures * Extruded aluminum double rung lock minimizes lock breakage * Modified ""I"" beam interlocking side rails * Alflo rung joint * Red polypropylene rope and pulley 20" and up