Telescopic Ladder Material- Telescoping extension ladder is crafted from premium aluminum alloy. The surface of aluminum is oxidized, which can prolong the life of folding ladder. And its plastic parts is reinforced with nylon fibre to improves load capacity, stability, aging resistance and extends service life. Our telescopic ladders have a maximum load of 330lb/150kg. Locking Mechanism- The independent locking mechanism allows the aluminum 20.3FT telescoping ladder to be locked at every step. Using the inward sliding latch, you can gradually adjust the stepping in units of one foot to easily reach and retract any desired height. (Pls take care your fingers when retract the ladder. Dont put your thumb between the ladder.) Safe and Reliable- Every pedal of telescopic ladder 20.3FT is striated for increased friction; stable locking secure pedals, avoiding bumping and falling off, high quality rubber feet, easy to secure the telescoping ladder to wall and floor. Humanized D