ZNB1079 Features: * Extension ladder * 250lbs duty rating * Mar-resistant end caps * Interlocking 3"" side rails * Smooth operating pulley * Slip-resistant 1-3/4"" Traction-Tred D-rungs * Heavy duty I-beam rails * Heavy duty spring loaded locks operation smoothly * Rope clamp ties rope to rung * Durable shoe rests flat or is held in spur position with Shu-Lok feature