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.