Crutchfield Customer Review (What's this?)
Added these to my 4-shelf Salamander Archetype rack. They are extremely heavy duty. Like the rack itself, it takes a little extra care to measure carefully to make sure everything is level. Carefully tighten lock nuts after everything is level. Then, everything is very stable and steady. For hardwood floors, I added Herbie's Audio Lab Cone/Spike Decoupling Gliders. Good combination. Spikes improve sound quality over furnished rubber feet.
Pros: Heavy duty
Cons: Floor protector disks are pointless; use Herbie's Audio Lab Cone/Spike Decoupling Gliders