1.     aluminium alloy single extensions ladder pole adopts high intensity, on aluminum, surface slippery stripe, CAI is investigated by the connecting rod and special riveting technique, by fluctuation section, lifting hook combination ladder, pulleys and leash makes sense, top ladder and ladder with hook, the use of security

2.     use high strength of aluminum alloy, simple operation, easy to carry, lightweight, strengthened collection of slide feet is safe and reliable