Rodrigo “Comprido” Medeiros--a two time open-weight World Champion--shows a simple wristlock in this video from cross side control. The technique is pretty straightforward, but the details are important (as always). The fundamentals of this particular wrist lock apply to a number of wrist locks from different positions. For instance, he reminds us that it's always "fingers to the wrist," and not "wrist to fingers"--which is sage advice for all you wrist lockers out there! So, watch, learn, and go train!