People usually do not consider step ladders before they have to climb it. Nevertheless, it is common in many places ----- a tool used to access attics, roofs and other high places.
Ladder is a daily life tool used for climbing. Many times ladders are tools we must use. Different situations require different ladders. It can not to purchase household ladders casually. You must choose the right material or type. Safety first, the correct use of ladders is also a special concern.