These cage nuts are for using with non-threaded square hole rack. Examples of racks/cases/cabinets using this type of nut include rack/case/cabinet from Chatsworth, SKB, Gator, Compaq, Dell and many more.
Features include:
M6 Thread Cage Style Rack Rail Retainer Nuts
M6 Thread by 3/4" Long Zinc Plated Pan Head Screw
Protective Fiber OR Nylon or Steel Washer to protect mounting surface