The aluminum extension ladder can be changed into many different shapes to meet your different height requirements and working needs. A scaffold, leaning ladder, or step ladder. 【SECURITY SECURITY CLICK & LOCK SYSTEM】 The lock design on each joint makes it convenient to fold and unfold the ladder. 【SAFETY & ANTI-SLIP DESIGN】The aluminum multi purpose folding ladder comes with 2 rubber feet to prevent slipping on smooth floors. It has zigzag anti-slip foot straps which can prevent ladder from sliding during use to a certain extent.