16. 5ft Telescopic Ladder is made of high-quality aluminum alloy. Plastic parts are reinforced with nylon fiber to improve load-bearing capacity, stability, anti-aging and extend service life. The maximum load of our telescopic ladder is 300 lbs. /150 kg. Independent locking mechanism allows the aluminum 16. 5FT telescopic ladder to lock at every step. Each step has stripes to increase friction; stable locking safety step to avoid collision and falling off.