Solves the problem of removing and replacing damaged wheel studs. Today's complex disc brake, four-wheel drive and front wheel drive vehicles make replacing damaged wheel studs a costly job, which frequently must be absorbed. If the rotor becomes bent or warped during stud replacement, then it must be turned; and if you turn one rotor, the other should be done also. A 30-second solution to an hour-long job. Every tire dealer needs one.