Features and Benefits: This kit assures correct installation of wheel studs the first time, every timeNo more ruined studs or lug nuts, and no more wasted timeEasy instruction/diagram sheet includedAutomotive kit includes installer sizes: 7/16″-20, 1/2″-20, 12mm-1.25, and 12mm-1.50, as well as a spacer and washer 6–Piece Wheel Stud Installer Kit for AutomobilesPatented six-piece set saves time by allowing you to install the new wheel stud correctly the first time.Self centering wheel stud installer kit insures that the thread is installed at the correct angle every time.Installer nuts will not damage wheel stud threads.Components are impact gun compatible.938 kit is intended for use on Automobiles and contains sizes: 7/16″”-20, 1/2″”-20, 12mm-1.25, and 12mm-1.50, plus spacer and washer.Patented