Features:Unique design allows the removal and installation of studs without damaging the threads.Suits all popular metric automotive studsEach stud size has one tool for removal and one tool for installationRemoval tool does not damage threadsInstallation tool allows tightening and torque without thread damage Stud Sizes:M6x1.0M8x1.25M10x1.25M10x1.5M12x1.5