The Sirui TY-50X Quick Release Plate for G10/G20/K20 Heads has a 1/4"-20 camera screw and features a rubberized surface for a more secure connection. It is compatible with the many other Arca-type quick release systems, such as Acratech, Foba, Graff and Wimberley. The two red buttons when inserted up, add a secondary security measure to prevent the camera or the lens from slipping off the plate, especially when it is tilted at an angle.