These are basically brackets that fit onto the end of your swingarm and onto your existing bottom shock mount. They move the bottom mount of your shock back a certain distance, which thereby lowers your bike. They have the advantages of:
(i) you keep your existing rear shocks
(ii) which means you preserve your riding comfort (shorter heavy duty shocks are a harder ride)
(ii) they are cheaper than buying another set of shorter shocks
Above are just a couple of the kits that are available.
