Not sure if the tool works or not but beware of this company! I ordered one as a Christmas present and they never shipped after several weeks, or even acknowledged my emails. But when I tried cancelling the order after Christmas through my payment provider, they suddenly remembered me and shipped the item after I requested the refund and despite my telling them that I no longer needed it! Now they won't respond to my request for a refund. They seem more interested in making a few dollars then in taking care of customers. Note that a better version of this is sold by ClampTite, who gets great reviews: http://www.clamptitetools.net/