Set of 4 as pictured with Allen wrench. These screw into the bottom of Paradigm Speakers to fasten speaker to the matching Paradigm Stands (J-29). I know for sure they work with Studio 10's and 20's v4 and v5. I'm assuming they work with other Paradigm book shelf speakers (Monitor and Signature Series), but I do not know for sure, so please be certain before purchasing. Free USPS shipping. Any questions please ask.