Telescoping Ladder Material- The sturdy frame of the 12.5 ft extension ladder is made of aluminum. resistant to wear, corrosion, rust, high and low temperatures, aging. Our telescopic ladder has a maximum load of 330 LBS. Telescopic Ladder Locking Mechanism- The independent locking mechanism allows the aluminum 12.5ft 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.)