2U Combo Drop-In/Stab-In Rails (B19)

Full Product Description (From the manufacturer)

The Ready Rails sliding rail kit for 2U Systems, provides tool-less support for racks with square or unthreaded round mounting holes including all generations of Dell racks. They also support tooled mounting in 4-post threaded racks via an optional adapter brackets kit. The optional cable management arm (CMA) can be mounted on either the left or right side of the sliding rails without the use of tools for fast and easy deployment. This product has been tested and validated on Dell systems. It is supported by Dell Technical Support when used with a Dell system.