How to attach lighting support rail and wire mesh tray to a wall?

Wall supports MEK SK are used for mounting MEK-type lighting support rails and wire mesh trays WMT to wall. Product set includes bolt and nut for fixing lighting supports rails to wall supports, but for mounting wire mesh trays connectors WMT CL can be ordered separately.

MEK: The fastener on the lighting support rail is turned sideways in the fishtail groove respective to the lighting support rail, and the screw is tightened.

WMT: Connector set WMT CL is used attach wire mesh tray to the wall support MEK SK.