The Powerhouse Racing Billet Adjustable Locking Cam Gears are the only gears in the world for the 2JZ that offer a way of locking the gear and absolutely eliminating any chance of slip. See our video below.The PHR Gear comes with the 0 position lock which will be the most widely used postion. For those wanting to adjust their cam timing the PHR adjusting kit is available. This kit allows adjustment from 1 degree to 9 degrees positive or negative and assures that your gear CANNOT SLIP FROM ITS ADJUSTED POSTION.