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.
adders are our daily necessities. They are made of two long and thick poles, which are crossed between the poles suitable for climbing.1. Preparations for Using Step Ladder(1) Ensure that all rivets, bolts, nuts and movable parts are tightly connected, that the step ladder column and the step ladder