The 9120 is a 10-32 threaded 10-32 x 3/4 captive nuts for 9102 combination rail. It is a necessary hardware to fasten equipment to rack rail. All hardware in 100-piece packages.
For 9102 combination rail
10-32 Threaded 10-32 x 3/4 Captive Nuts
All hardware in 100-piece packages
Applications:
Necessary hardware to fasten equipment to rack rail