AP-4022 is safe and reliable. Our company uses high-quality aluminum materials and exquisite craftsmanship for production. Its weight is up to 150KG. For added safety we installed Heavy-duty rubber pads at the foot of the ladder. Heavy-duty rubber pads provide resistance to wear and ensure a solid grip on all floor surfaces. Safety locks & bottom rubber protective pads for safety work. This aluminum ladder can be used as scaffold, leaning ladder, stepladder and also can be changed into many different shapes to meet different height requirements and working needs. It can be used in different ways. For example, it can be used as a temporary bridge or at construction. In addition, it can be used as single ladder, double sided ladder, trestle, stair ladder, telescoping ladder, twin stepladder, stairway stepladder, or as two scaffold bases etc.