its just a conductive path from you to the ground, so if you were to wrap a bare wire around your wrist and either connect it to the case(sufficient capacity to serve as a ground, or truly grounded once the PSU is installed) or inserted it into the ground of an outlet you would have yourself an anti static wrist strap. I know some people who swear by them but most people i know dont use them, just touch the case periodically and you will discharge your static often enough to not have it be a problem.