These are the isolation footers that are used in those excellent HRS M1 and S1 shelves that literally perform magic, a lot of it has to be credited to the feet that was the result of the designer's experience in the defence and aerospace industry.

This is a set of four green loading feet. They are designed to support 50-90 pounds including the weight of a shelf if you're planning to install the feet on the bottom of a shelf made by other manufacturer or one that you have made or plan on making.

These feet come with 5/16-inch threaded bolts that you should fasten into a fixture. Many potential uses:
- you could use these feet as coupling between HRS audio rack and your homemade shelf.
- you could use them under your audio component or speakers
- use them as additional isolation on any shelf/rack.