Indoor Full Color Series LED Display is Made of 5052 aluminum, low lead tolerance, high rigidity which keeps the display contact area flat and is not deformative. Fast lock, lock cabinets tightly in vertical. Precise size guarantee of cabinet keeps less than 0.2mm diagonal error when cabinets connected. Easy installation, lock cabinets tightly in vertical. Wire drawing boron coating , makes cabinet cool and quiet. Neutrik socket,with quality of high reliability. Black face, high contrast ratio. Multiple location pin make cabinets in the same level when connected.