Premium Quality: the telescopic ladder is constructed from aluminium alloy, which is corrosion resistant, rust resistant, and long service life. The Open Height of aluminium ladder is 4.1M (13.5ft). Interval: ca. 28cm. Maximum load for this ladder is 150kg. The weight of user plus tools and materials should not exeed 150kg. Safety Use: Each step in the ladder has a pair of locking mechanisms. These consist of spring-loaded steel pins that automatically lock into place as the ladder is extended. When pulling up the step, locking mechanisms may appear to audibly "click" shut, but always visually check that the levers appear locked. The locking mechanism must be fully secured before use. Small Folding Size: Folding height is 88cm. When fully retracted the ladder can be easily moved around, or carry it under your arm to some places, and easy to store in your garage, shed, car boot, or under your bed. Please UNLOCK TH STEPS from the bottom to the upper level until they are fully retracted. Anti-Slip Design: 4.1M collapsible ladder have 14 steps. Each rung is designed in 39mm extra wide, and anti-slip surface. Friction profiles on rungs minimize the risk of slipping, allowing you easy to climb up or climb down. Non-slip end caps hold ladders firmly in place while working. Always set up the ladder on a surface that is level, stable and dry. Wide Application: You can use the extendable ladder to carry out maintenance in and outside house, or use it to reach your loft. This folding ladder should be part of any household and tool kit. Warm Tip, before using this aluminium telescopic ladders, please read the instructions carefully.