Led Screen size : 500 x 500 mm / 1000 x 500mm  both can use this clamps 
Stand size can be OEM . 

LED screen from groud level is now easy, whatever your type of scrren is. This LED video wall ground support system is a combination of a base-unit, connection bar and ladder truss, creates a very stable system to support your LED screens in various configurations and offers flexibility in height as well as width.

A side entry clamp with the universal connectiom plate mounted makes it possible to mount almost any type of LED panel quick and easy. By using longer connection bars, you can easily extend your screen with another row of panels. Using the adjustable feet in the front and back of the base unit, you can safely level the system, so your screen is completely straight.