A cage nut or caged nut (also called a captive or clip nut) consists of a (usually square) nut in a spring steel cage which wraps around the nut. The cage has two wings that when compressed allow the cage to be inserted into the square holes, for example, in the mounting rails of equipment racks. When the wings are released, they hold the nut in position behind the hole..
M6 Cage Nut Kit including 1pc M6 Cage nut, 1pc M6*16mm Pan Head Machine Screw & M6 Black Plastic Washer.