L250F uses round arm cross section as features, and appearance is simple and elegant. The spider can be used as a rotatable adjustment device, and applied to corner parts of the point of the curtain wall, and structure is simple and practical. The spider is made by precision casting process, and external surface is polished into finished products. Product performance is in line with JG / T 138-2010 <<architectural glass point support device>> and the relevant national standards. Spider from the same series has three legs, two legs and single leg structure, and is widely used in point-fixed glass curtain wall.