the type : JYK
Cage Nuts consists of a spring steel cage, designed to clip onto a square hole, within which is a threaded nut. Cage nuts combine the best advantages of spring steel fasteners with the high strength of a threaded nut. In the event of a nut being stripped out or a bolt breaking, the nut can be simply removed and replaced with a new one.
The nut floats within the spring steel cage to mate normal hole misalignment. The installation is easy with no require for special tools.
stainless steel and carbon steel materials are available.